fix(commands): point set.mode description at the schema enum

Old description said "auto / manual" but the schema declares four modes
(auto, virtualControl, fysicalControl, maintenance). New description
enumerates the allowed values and refers readers to the schema as the
source of truth. wiki-gen regenerated Reference-Contracts.md to match.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

CLAUDE.md

@@ -21,3 +21,20 @@ Key points for this node:
 - Stack same-level siblings vertically.
 - Parent/children sit on adjacent lanes (children one lane left, parent one lane right).
 - Wrap in a Node-RED group box coloured `#86bbdd` (Equipment Module).
+
+## Folder & File Layout
+
+Every per-node file MUST use the folder name (`valve`) **exactly**, case-sensitive. Full rule: [`.claude/rules/node-architecture.md`](https://gitea.wbd-rd.nl/RnD/EVOLV/src/branch/development/.claude/rules/node-architecture.md) in the EVOLV superproject.
+
+| Path | Required name |
+|---|---|
+| Entry file | `valve.js` |
+| Editor HTML | `valve.html` |
+| Node adapter | `src/nodeClass.js` |
+| Domain logic | `src/specificClass.js` |
+| Editor JS modules | `src/editor/*.js` (extract when inline editor JS exceeds ~50 lines) |
+| Tests | `test/{basic,integration,edge}/*.test.js` |
+| Example flows | `examples/*.flow.json` |
+
+
+When adding new files, read the rule above first to avoid drift.

CONTRACT.md

@@ -0,0 +1,95 @@
+# valve — Contract
+
+Generated from `src/commands/index.js` (canonical topic + alias list) plus
+the hand-written events section. Keep ≤ 100 lines.
+
+## Inputs (msg.topic on Port 0)
+
+| Canonical | Aliases (deprecated) | Payload | Effect |
+|---|---|---|---|
+| `set.mode` | `setMode` | `string` — one of the allowed mode names | Calls `source.setMode(payload)`. Invalid mode logs `warn` and is dropped. |
+| `cmd.startup` | — | `{ source?: string }` | Calls `source.handleInput(payload.source ?? 'parent', 'execSequence', 'startup')`. |
+| `cmd.shutdown` | — | `{ source?: string }` | Calls `source.handleInput(payload.source ?? 'parent', 'execSequence', 'shutdown')`. Pre-shutdown the valve ramps to position 0 if currently operational. |
+| `cmd.estop` | `emergencystop`, `emergencyStop` | `{ source?: string, action?: string }` | Calls `source.handleInput(payload.source ?? 'parent', payload.action ?? 'emergencystop')`. |
+| `execSequence` | — (legacy umbrella) | `{ source, action, parameter }` with `action ∈ {'startup','shutdown','emergencyStop','emergencystop'}` | Content-based router: forwards to canonical `cmd.startup` / `cmd.shutdown` / `cmd.estop` based on `payload.action`. Unknown action logs `warn`. Prefer the canonical `cmd.*` topics. |
+| `set.position` | `execMovement` | `{ source, action, setpoint }` — setpoint coerced to `Number`; valve position percent in `[0, 100]` | Calls `source.handleInput(payload.source ?? 'parent', payload.action ?? 'execMovement', Number(payload.setpoint))`. |
+| `data.flow` | `updateFlow` | `{ variant, value, position, unit? }` — `variant ∈ {'measured','predicted'}` | Pushes a flow value into the measurement container at `<position>` and triggers a deltaP recompute through the hydraulic model. |
+| `query.curve` | `showcurve` | none | Calls `source.showCurve()` and replies on **Port 0** with `{ topic: 'Showing curve', payload: <result> }` via `ctx.send`. |
+| `child.register` | `registerChild` | `string` — child Node-RED id; `msg.positionVsParent` carries position | Resolves child via `RED.nodes.getNode(payload)` and registers it through `childRegistrationUtils.registerChild(child.source, msg.positionVsParent)`. The valve's `registerChild` records the child for fluid-contract tracking. |
+
+Aliases log a one-time deprecation warning the first time they fire.
+
+### `execSequence` demux
+
+The pre-refactor topic `execSequence` carried `{ source, action, parameter }`
+where `action` selected the verb. The command registry does not natively
+dispatch by payload content, so `execSequence` keeps its own descriptor
+whose handler forwards directly to the canonical `cmd.startup` /
+`cmd.shutdown` / `cmd.estop` handler based on `payload.action`. The
+deprecation warning fires once. Future-Phase-7 removal of `execSequence`
+is a behavioural change — callers must migrate to the canonical topics.
+
+## Outputs (msg.topic on Port 0/1/2)
+
+- **Port 0 (process):** `msg.topic = config.general.name`. Payload built by
+  `outputUtils.formatMsg(..., 'process')` from `getOutput()` — delta-compressed
+  (only changed fields are emitted). On `query.curve` the node additionally
+  emits `{ topic: 'Showing curve', payload: <result> }` as a synchronous
+  reply on Port 0.
+- **Port 1 (InfluxDB telemetry):** same shape as Port 0, formatted with the
+  `'influxdb'` formatter.
+- **Port 2 (registration):** at startup the node sends one
+  `{ topic: 'child.register', payload: <node.id>, positionVsParent, distance }`
+  to its upstream parent (typically a `valveGroupControl`).
+  `positionVsParent` defaults to `'atEquipment'`.
+
+`getOutput()` keys per tick include: `<position>_<variant>_<type>` slots
+from the measurement container (e.g. `delta_predicted_pressure`,
+`downstream_measured_flow`), plus `state`, `percentageOpen`, `moveTimeleft`,
+`mode`.
+
+## Events emitted by `source.emitter`
+
+- `deltaPChange` — fires whenever the hydraulic model recomputes a finite
+  deltaP. Data: the deltaP value in `unitPolicy.output.pressure` (default
+  `mbar`). Consumed by `valveGroupControl` to update group totals.
+- `fluidCompatibilityChange` — fires when the upstream fluid-contract
+  status changes (status / expected / received / sourceCount / message).
+  Data: `FluidCompatibility.getCompatibility()`.
+- `fluidContractChange` — fires whenever the fluid contract that this valve
+  advertises downstream changes. Data: `FluidCompatibility.getContract()`.
+
+## Events emitted by `source.state.emitter`
+
+- `positionChange` — fires when the position percentage changes (per
+  movement tick). Data: `{ position, state, mode, timestamp }`. The valve
+  itself listens and triggers a Kv lookup + deltaP recompute.
+- `stateChange` — fires on transitions of the operating state machine
+  (`idle → starting → warmingup → operational → accelerating →
+  decelerating → stopping → coolingdown → idle`, plus `off`).
+
+## Events emitted by `source.measurements.emitter`
+
+The `MeasurementContainer` fires `<type>.<variant>.<position>` whenever
+a series receives a new value. Parents subscribe via the generic
+`child.measurements.emitter.on(eventName, ...)` handshake. valve
+publishes:
+
+- `pressure.predicted.delta` — predicted pressure drop across the valve.
+- `pressure.measured.<position>`, `pressure.predicted.<position>` — when
+  upstream pressure data arrives via `data.flow`-driven recompute or
+  direct measurement pushes.
+- `flow.measured.<position>`, `flow.predicted.<position>` — mirrored from
+  upstream sources via `data.flow`.
+
+Position labels are normalised to lowercase in the event name.
+
+## Children registered by this node
+
+valve accepts upstream sources (`machine`, `rotatingmachine`,
+`machinegroup`, `machinegroupcontrol`, `pumpingstation`, `valvegroupcontrol`,
+…) via `child.register`. The handler records each child for fluid-contract
+tracking: the valve reads either the child's `getFluidContract()` result,
+its `asset.serviceType` field, or a default per software type
+(`liquid` for the rotating-equipment family). It then subscribes to the
+child's `fluidContractChange` so re-keyed contracts propagate.

package.json

@@ -4,7 +4,10 @@
   "description": "Control module valve",
   "main": "valve.js",
   "scripts": {
-    "test": "node --test test/basic/*.test.js test/integration/*.test.js test/edge/*.test.js"
+    "test": "node --test test/basic/*.test.js test/integration/*.test.js test/edge/*.test.js",
+    "wiki:contract":  "node ../generalFunctions/scripts/wikiGen.js contract  ./src/commands/index.js   --write ./wiki/Home.md",
+    "wiki:datamodel": "node ../generalFunctions/scripts/wikiGen.js datamodel ./src/specificClass.js     --write ./wiki/Home.md",
+    "wiki:all":       "npm run wiki:contract && npm run wiki:datamodel"
   },
   "repository": {
     "type": "git",

src/commands/handlers.js

@@ -0,0 +1,66 @@
+'use strict';
+
+// Valve command handlers. Each receives (source, msg, ctx) where source is
+// the domain instance, msg is the incoming Node-RED message, and ctx carries
+// { node, RED, send, logger } per BaseNodeAdapter.
+
+function _logger(source, ctx) { return ctx?.logger || source?.logger || null; }
+function _send(ctx, ports) { if (typeof ctx?.send === 'function') ctx.send(ports); }
+
+exports.setMode = (source, msg) => {
+  source.setMode(msg.payload);
+};
+
+exports.startup = async (source, msg) => {
+  const p = msg.payload || {};
+  await source.handleInput(p.source ?? 'parent', 'execSequence', 'startup');
+};
+
+exports.shutdown = async (source, msg) => {
+  const p = msg.payload || {};
+  await source.handleInput(p.source ?? 'parent', 'execSequence', 'shutdown');
+};
+
+exports.estop = async (source, msg) => {
+  const p = msg.payload || {};
+  await source.handleInput(p.source ?? 'parent', p.action ?? 'emergencystop');
+};
+
+// Legacy umbrella: payload.action selects the canonical verb.
+exports.execSequenceAlias = async (source, msg, ctx) => {
+  const log = _logger(source, ctx);
+  const action = msg?.payload?.action;
+  if (action === 'startup') return exports.startup(source, msg, ctx);
+  if (action === 'shutdown') return exports.shutdown(source, msg, ctx);
+  if (action === 'emergencyStop' || action === 'emergencystop') {
+    return exports.estop(source, msg, ctx);
+  }
+  log?.warn?.(`execSequence: unsupported action '${action}'`);
+};
+
+exports.setPosition = async (source, msg) => {
+  const p = msg.payload || {};
+  const action = p.action ?? 'execMovement';
+  await source.handleInput(p.source ?? 'parent', action, Number(p.setpoint));
+};
+
+exports.dataFlow = (source, msg) => {
+  const p = msg.payload || {};
+  source.updateFlow(p.variant, p.value, p.position, p.unit || source.unitPolicyView?.output?.flow);
+};
+
+exports.queryCurve = (source, msg, ctx) => {
+  const reply = Object.assign({}, msg, { topic: 'Showing curve', payload: source.showCurve() });
+  _send(ctx, [reply, null, null]);
+};
+
+exports.registerChild = (source, msg, ctx) => {
+  const log = _logger(source, ctx);
+  const childId = msg.payload;
+  const childObj = ctx?.RED?.nodes?.getNode?.(childId);
+  if (!childObj || !childObj.source) {
+    log?.warn?.(`registerChild: child '${childId}' not found or has no .source`);
+    return;
+  }
+  source.childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent);
+};

src/commands/index.js

@@ -0,0 +1,75 @@
+'use strict';
+
+// valve command registry — consumed by BaseNodeAdapter. Canonical topics
+// follow CONTRACTS.md §1; legacy names are kept as aliases (one-time
+// deprecation warning when fired).
+
+const handlers = require('./handlers');
+
+module.exports = [
+  {
+    topic: 'set.mode',
+    aliases: ['setMode'],
+    payloadSchema: { type: 'string' },
+    description: 'Switch the operating mode. Allowed: `auto`, `virtualControl`, `fysicalControl`, `maintenance` (schema-validated in `valve.json` → `mode.current`).',
+    handler: handlers.setMode,
+  },
+  {
+    topic: 'cmd.startup',
+    payloadSchema: { type: 'any' },
+    description: 'Initiate the valve startup sequence.',
+    handler: handlers.startup,
+  },
+  {
+    topic: 'cmd.shutdown',
+    payloadSchema: { type: 'any' },
+    description: 'Initiate the valve shutdown sequence.',
+    handler: handlers.shutdown,
+  },
+  {
+    topic: 'cmd.estop',
+    aliases: ['emergencystop', 'emergencyStop'],
+    payloadSchema: { type: 'any' },
+    description: 'Trigger an emergency stop on the valve.',
+    handler: handlers.estop,
+  },
+  // Content-based demux; behaviour matches cmd.startup/cmd.shutdown exactly.
+  {
+    topic: 'execSequence',
+    payloadSchema: { type: 'object' },
+    description: 'Legacy umbrella that demuxes payload.action to startup / shutdown / estop.',
+    handler: handlers.execSequenceAlias,
+    _legacy: true,
+  },
+  {
+    topic: 'set.position',
+    aliases: ['execMovement'],
+    payloadSchema: { type: 'object' },
+    // Control-percent position — no units field (no `percent` measure in convert).
+    description: 'Move the valve to a control-% position via execMovement.',
+    handler: handlers.setPosition,
+  },
+  {
+    topic: 'data.flow',
+    aliases: ['updateFlow'],
+    payloadSchema: { type: 'object' },
+    // Compound payload `{variant, value, position, unit}` — handler converts
+    // internally via unitPolicy; registry normalisation is skipped.
+    description: 'Push a measured flow into the valve (variant + position + unit).',
+    handler: handlers.dataFlow,
+  },
+  {
+    topic: 'query.curve',
+    aliases: ['showcurve'],
+    payloadSchema: { type: 'any' },
+    description: 'Return the valve characteristic curve on the reply port.',
+    handler: handlers.queryCurve,
+  },
+  {
+    topic: 'child.register',
+    aliases: ['registerChild'],
+    payloadSchema: { type: 'string' },
+    description: 'Register a child measurement with this valve.',
+    handler: handlers.registerChild,
+  },
+];

src/curve/supplierCurve.js

@@ -0,0 +1,95 @@
+'use strict';
+
+const { loadCurve, predict } = require('generalFunctions');
+
+const FALLBACK_SUPPLIER_CURVE = Object.freeze({
+  '1.204': { '125': { x: [0, 100], y: [0, 1] } },
+});
+
+function isValidCurveData(curveData) {
+  if (!curveData || typeof curveData !== 'object') return false;
+  const dKeys = Object.keys(curveData);
+  if (!dKeys.length) return false;
+  for (const dk of dKeys) {
+    const diameters = curveData[dk];
+    if (!diameters || typeof diameters !== 'object') return false;
+    const diaKeys = Object.keys(diameters);
+    if (!diaKeys.length) return false;
+    for (const k of diaKeys) {
+      const c = diameters[k];
+      if (!Array.isArray(c?.x) || !Array.isArray(c?.y) || c.x.length < 2 || c.x.length !== c.y.length) return false;
+    }
+  }
+  return true;
+}
+
+function pickNearestNumericKey(keys, target) {
+  const numeric = keys.map((k) => Number(k)).filter((v) => Number.isFinite(v));
+  if (!numeric.length) return String(target);
+  let selected = numeric[0];
+  let dist = Math.abs(selected - target);
+  for (const k of numeric) {
+    const d = Math.abs(k - target);
+    if (d < dist) { selected = k; dist = d; }
+  }
+  return String(selected);
+}
+
+class SupplierCurvePredictor {
+  constructor({ logger, model, configCurve, defaultDensity, defaultTemperatureK, rho, temperatureK, valveDiameter }) {
+    this.logger = logger;
+    this.model = model;
+    this.curve = model ? loadCurve(model) : null;
+    this._configCurve = configCurve;
+    this.defaultDensity = defaultDensity;
+    this.defaultTemperatureK = defaultTemperatureK;
+    this.rho = Number.isFinite(rho) && rho > 0 ? rho : defaultDensity;
+    this.T = Number.isFinite(temperatureK) && temperatureK > 0 ? temperatureK : defaultTemperatureK;
+    this._init(valveDiameter);
+  }
+
+  _init(valveDiameter) {
+    const supplierCurve = this._resolveData();
+    const densityTarget = Number.isFinite(this.rho) && this.rho > 0 ? this.rho : this.defaultDensity;
+    const densityKey = pickNearestNumericKey(Object.keys(supplierCurve), densityTarget);
+    const densityCurveFamily = supplierCurve[densityKey];
+    const diaTarget = Number(valveDiameter);
+    const diameterKey = pickNearestNumericKey(
+      Object.keys(densityCurveFamily || {}),
+      Number.isFinite(diaTarget) && diaTarget > 0 ? diaTarget : 125
+    );
+    this.curveSelection = { densityKey: Number(densityKey), diameterKey: Number(diameterKey) };
+    this.predictKv = new predict({ curve: densityCurveFamily || FALLBACK_SUPPLIER_CURVE['1.204'] });
+    this.predictKv.fDimension = this.curveSelection.diameterKey;
+  }
+
+  _resolveData() {
+    if (isValidCurveData(this.curve)) return this.curve;
+    if (isValidCurveData(this._configCurve)) return this._configCurve;
+    this.logger.warn('No valid supplier curve data found, using fallback curve.');
+    return FALLBACK_SUPPLIER_CURVE;
+  }
+
+  predictKvForPosition(positionPercent) {
+    if (!this.predictKv) return 0.1;
+    try {
+      this.predictKv.fDimension = this.curveSelection?.diameterKey || this.predictKv.fDimension;
+      const kv = Number(this.predictKv.y(positionPercent));
+      if (!Number.isFinite(kv)) return 0.1;
+      return Math.max(0.1, kv);
+    } catch (error) {
+      this.logger.warn(`Failed to predict Kv for position=${positionPercent}: ${error.message}`);
+      return 0.1;
+    }
+  }
+
+  snapshot() {
+    return {
+      selectedDensity: this.curveSelection?.densityKey ?? null,
+      selectedDiameter: this.curveSelection?.diameterKey ?? null,
+      curve: this.predictKv?.currentFxyCurve?.[this.predictKv?.fDimension] || null,
+    };
+  }
+}
+
+module.exports = { SupplierCurvePredictor, FALLBACK_SUPPLIER_CURVE };

src/flow/flowController.js

@@ -0,0 +1,84 @@
+'use strict';
+
+// Sequence + setpoint execution. Mirrors the pre-refactor Valve.handleInput
+// switch but delegates state transitions to host.state. Pre-shutdown ramp-down
+// to 0 happens here so the existing test contract holds.
+
+class FlowController {
+  constructor(host) {
+    this.host = host;
+    this.logger = host.logger;
+  }
+
+  isValidSourceForMode(source, mode) {
+    const allowed = this.host.config.mode.allowedSources[mode] || [];
+    return allowed.has(source);
+  }
+
+  async handleInput(source, action, parameter) {
+    if (!this.isValidSourceForMode(source, this.host.currentMode)) {
+      const msg = `Source '${source}' is not valid for mode '${this.host.currentMode}'.`;
+      this.logger.warn(msg);
+      return { status: false, feedback: msg };
+    }
+    this.logger.info(`Handling input from source '${source}' with action '${action}' in mode '${this.host.currentMode}'.`);
+    try {
+      switch (action) {
+        case 'execSequence':
+          await this.executeSequence(parameter);
+          break;
+        case 'execMovement':
+          await this.setpoint(parameter);
+          break;
+        case 'emergencyStop':
+        case 'emergencystop':
+          this.logger.warn(`Emergency stop activated by '${source}'.`);
+          await this.executeSequence('emergencystop');
+          break;
+        case 'statusCheck':
+          this.logger.info(`Status Check: Mode = '${this.host.currentMode}', Source = '${source}'.`);
+          break;
+        default:
+          this.logger.warn(`Action '${action}' is not implemented.`);
+      }
+      this.logger.debug(`Action '${action}' successfully executed`);
+      return { status: true, feedback: `Action '${action}' successfully executed.` };
+    } catch (error) {
+      this.logger.error(`Error handling input: ${error}`);
+    }
+  }
+
+  async executeSequence(sequenceName) {
+    const sequence = this.host.config.sequences[sequenceName];
+    if (!sequence || sequence.size === 0) {
+      this.logger.warn(`Sequence '${sequenceName}' not defined.`);
+      return;
+    }
+    if (this.host.state.getCurrentState() === 'operational' && sequenceName === 'shutdown') {
+      this.logger.info(`Machine will ramp down to position 0 before performing ${sequenceName} sequence`);
+      await this.setpoint(0);
+    }
+    this.logger.info(` --------- Executing sequence: ${sequenceName} -------------`);
+    for (const stateName of sequence) {
+      try {
+        await this.host.state.transitionToState(stateName);
+      } catch (error) {
+        this.logger.error(`Error during sequence '${sequenceName}': ${error}`);
+        break;
+      }
+    }
+  }
+
+  async setpoint(value) {
+    try {
+      if (typeof value !== 'number' || value < 0) {
+        throw new Error('Invalid setpoint: Setpoint must be a non-negative number.');
+      }
+      await this.host.state.moveTo(value);
+    } catch (error) {
+      this.logger.error(`Error setting setpoint: ${error}`);
+    }
+  }
+}
+
+module.exports = FlowController;

src/fluid/fluidCompatibility.js

@@ -0,0 +1,201 @@
+'use strict';
+
+const SERVICE_TYPES = new Set(['gas', 'liquid']);
+const DEFAULT_SOURCE_SERVICE_TYPE = Object.freeze({
+  machine: 'liquid',
+  rotatingmachine: 'liquid',
+  machinegroup: 'liquid',
+  machinegroupcontrol: 'liquid',
+  pumpingstation: 'liquid',
+});
+
+function normalizeOptional(value) {
+  const raw = String(value || '').trim().toLowerCase();
+  return SERVICE_TYPES.has(raw) ? raw : null;
+}
+
+function defaultForSoftwareType(softwareType) {
+  const key = String(softwareType || '').trim().toLowerCase();
+  return DEFAULT_SOURCE_SERVICE_TYPE[key] || null;
+}
+
+class FluidCompatibility {
+  constructor({ logger, emitter, expectedServiceType }) {
+    this.logger = logger;
+    this.emitter = emitter;
+    this.expectedServiceType = expectedServiceType || null;
+    this.upstreamFluidSources = new Map();
+    this._fluidContractListeners = new Map();
+    this.state = {
+      status: this.expectedServiceType ? 'pending' : 'unknown',
+      expectedServiceType: this.expectedServiceType,
+      receivedServiceType: null,
+      upstreamServiceTypes: [],
+      sourceCount: 0,
+      message: this.expectedServiceType
+        ? `Waiting for upstream fluid contract (${this.expectedServiceType}).`
+        : 'No upstream fluid contract available.',
+    };
+  }
+
+  registerChild(child, softwareType) {
+    if (!child || typeof child !== 'object') {
+      this.logger.warn('registerChild skipped: invalid child payload');
+      return false;
+    }
+    const sourceType = String(softwareType || child?.config?.functionality?.softwareType || '').trim().toLowerCase();
+    const sourceId = child?.config?.general?.id
+      || child?.config?.general?.name
+      || `source-${this.upstreamFluidSources.size + 1}`;
+    const contract = this._extractContract(child, sourceType);
+    this.upstreamFluidSources.set(sourceId, { child, sourceType, contract });
+    this._bindListener(sourceId, child, sourceType);
+    this._updateState();
+    this.logger.info(`Source '${sourceId}' (${sourceType || 'unknown'}) registered for fluid contract.`);
+    return true;
+  }
+
+  _extractContract(child, softwareType) {
+    const sourceType = String(softwareType || child?.config?.functionality?.softwareType || '').trim().toLowerCase();
+    let fromChild = null;
+    if (typeof child?.getFluidContract === 'function') {
+      try { fromChild = child.getFluidContract(); }
+      catch (error) { this.logger.warn(`Failed to read child fluid contract: ${error.message}`); }
+    }
+    const status = String(fromChild?.status || '').trim().toLowerCase();
+    if (status === 'conflict') return { status: 'conflict', serviceType: null, sourceType };
+    const contractType = normalizeOptional(fromChild?.serviceType);
+    if (contractType) return { status: 'resolved', serviceType: contractType, sourceType };
+    const directType = normalizeOptional(
+      child?.serviceType || child?.expectedServiceType || child?.config?.asset?.serviceType
+    );
+    if (directType) return { status: 'resolved', serviceType: directType, sourceType };
+    const fallback = defaultForSoftwareType(sourceType);
+    if (fallback) return { status: 'inferred', serviceType: fallback, sourceType };
+    return { status: 'unknown', serviceType: null, sourceType };
+  }
+
+  _bindListener(sourceId, child, sourceType) {
+    if (!sourceId || this._fluidContractListeners.has(sourceId)) return;
+    if (!child?.emitter || typeof child.emitter.on !== 'function') return;
+    const handler = () => {
+      const latest = this._extractContract(child, sourceType);
+      const existing = this.upstreamFluidSources.get(sourceId) || {};
+      existing.contract = latest;
+      this.upstreamFluidSources.set(sourceId, existing);
+      this._updateState();
+    };
+    child.emitter.on('fluidContractChange', handler);
+    this._fluidContractListeners.set(sourceId, { emitter: child.emitter, handler });
+  }
+
+  _computeSnapshot() {
+    const expectedServiceType = this.expectedServiceType || null;
+    const contracts = Array.from(this.upstreamFluidSources.values())
+      .map((entry) => entry?.contract)
+      .filter(Boolean);
+    const upstreamServiceTypes = Array.from(new Set(
+      contracts.map((c) => normalizeOptional(c.serviceType)).filter(Boolean)
+    ));
+    const hasConflict = contracts.some((c) => String(c.status || '').toLowerCase() === 'conflict');
+    const sourceCount = this.upstreamFluidSources.size;
+
+    if (hasConflict || upstreamServiceTypes.length > 1) {
+      return {
+        status: 'conflict', expectedServiceType,
+        receivedServiceType: upstreamServiceTypes.length === 1 ? upstreamServiceTypes[0] : null,
+        upstreamServiceTypes, sourceCount,
+        message: `Conflicting upstream fluids detected: ${upstreamServiceTypes.join(', ') || 'unknown'}.`,
+      };
+    }
+    if (upstreamServiceTypes.length === 1) {
+      const receivedServiceType = upstreamServiceTypes[0];
+      if (expectedServiceType && expectedServiceType !== receivedServiceType) {
+        return {
+          status: 'mismatch', expectedServiceType, receivedServiceType,
+          upstreamServiceTypes, sourceCount,
+          message: `Expected ${expectedServiceType}, received ${receivedServiceType}.`,
+        };
+      }
+      return {
+        status: expectedServiceType ? 'match' : 'inferred',
+        expectedServiceType, receivedServiceType,
+        upstreamServiceTypes, sourceCount,
+        message: expectedServiceType
+          ? `Fluid contract validated: ${receivedServiceType}.`
+          : `Fluid inferred from upstream: ${receivedServiceType}.`,
+      };
+    }
+    return {
+      status: expectedServiceType ? 'pending' : 'unknown',
+      expectedServiceType, receivedServiceType: null,
+      upstreamServiceTypes: [], sourceCount,
+      message: expectedServiceType
+        ? `Waiting for upstream fluid contract (${expectedServiceType}).`
+        : 'No upstream fluid contract available.',
+    };
+  }
+
+  _updateState() {
+    const next = this._computeSnapshot();
+    const prev = this.state || {};
+    const changed = (
+      prev.status !== next.status
+      || prev.expectedServiceType !== next.expectedServiceType
+      || prev.receivedServiceType !== next.receivedServiceType
+      || prev.sourceCount !== next.sourceCount
+      || (prev.message || '') !== (next.message || '')
+    );
+    this.state = next;
+    if (!changed) return;
+    if (next.status === 'mismatch' || next.status === 'conflict') {
+      this.logger.warn(`Fluid compatibility warning: ${next.message}`);
+    } else {
+      this.logger.info(`Fluid compatibility update: ${next.message}`);
+    }
+    this.emitter.emit('fluidCompatibilityChange', this.getCompatibility());
+    this.emitter.emit('fluidContractChange', this.getContract());
+  }
+
+  getCompatibility() {
+    const s = this.state || {};
+    return {
+      status: s.status || 'unknown',
+      expectedServiceType: s.expectedServiceType || null,
+      receivedServiceType: s.receivedServiceType || null,
+      upstreamServiceTypes: Array.isArray(s.upstreamServiceTypes) ? [...s.upstreamServiceTypes] : [],
+      sourceCount: Number(s.sourceCount) || 0,
+      message: s.message || '',
+    };
+  }
+
+  getContract() {
+    const c = this.getCompatibility();
+    if (c.status === 'conflict') {
+      return {
+        status: 'conflict', serviceType: null,
+        expectedServiceType: c.expectedServiceType,
+        observedServiceType: c.receivedServiceType,
+        source: 'valve',
+      };
+    }
+    const advertised = c.expectedServiceType || null;
+    return {
+      status: advertised ? 'resolved' : 'unknown',
+      serviceType: advertised,
+      expectedServiceType: c.expectedServiceType,
+      observedServiceType: c.receivedServiceType,
+      source: 'valve',
+    };
+  }
+
+  destroy() {
+    for (const { emitter, handler } of this._fluidContractListeners.values()) {
+      if (typeof emitter?.off === 'function') emitter.off('fluidContractChange', handler);
+      else if (typeof emitter?.removeListener === 'function') emitter.removeListener('fluidContractChange', handler);
+    }
+    this._fluidContractListeners.clear();
+  }
+}
+
+module.exports = { FluidCompatibility, normalizeOptional, defaultForSoftwareType };

src/io/output.js

@@ -0,0 +1,73 @@
+'use strict';
+
+const { statusBadge } = require('generalFunctions');
+
+const STATE_SYMBOLS = {
+  off: '⬛', idle: '⏸️', operational: '⏵️',
+  starting: '⏯️', warmingup: '🔄', accelerating: '⏩',
+  stopping: '⏹️', coolingdown: '❄️', decelerating: '⏪',
+};
+
+const STATE_FILL = {
+  off: 'red', idle: 'blue',
+  operational: 'green', warmingup: 'green',
+  starting: 'yellow', accelerating: 'yellow',
+  stopping: 'yellow', coolingdown: 'yellow', decelerating: 'yellow',
+};
+
+const SHOW_METRICS = new Set(['operational', 'warmingup', 'accelerating', 'decelerating']);
+
+function buildOutput(host) {
+  const output = {};
+  Object.entries(host.measurements.measurements || {}).forEach(([type, variants]) => {
+    Object.entries(variants || {}).forEach(([variant, positions]) => {
+      Object.keys(positions || {}).forEach((position) => {
+        const unit = host._outputUnitForType(type);
+        const value = host._readMeasurement(type, variant, position, unit);
+        if (value != null) output[`${position}_${variant}_${type}`] = value;
+      });
+    });
+  });
+  output.state = host.state.getCurrentState();
+  output.percentageOpen = host.state.getCurrentPosition();
+  output.moveTimeleft = host.state.getMoveTimeLeft();
+  output.mode = host.currentMode;
+  return output;
+}
+
+function buildStatusBadge(host) {
+  try {
+    const mode = host.currentMode;
+    const stateName = host.state.getCurrentState();
+    const flowUnit = host.unitPolicyView.output.flow || 'm3/h';
+    const pressureUnit = host.unitPolicyView.output.pressure || 'mbar';
+    const flow = Math.round(host.measurements.type('flow').variant('predicted').position('downstream').getCurrentValue(flowUnit));
+    let deltaP = host.measurements.type('pressure').variant('predicted').position('delta').getCurrentValue(pressureUnit);
+    if (deltaP !== null && deltaP !== undefined) deltaP = parseFloat(deltaP.toFixed(0));
+    if (Number.isNaN(deltaP)) deltaP = '∞';
+    const pos = Math.round(host.state.getCurrentPosition() * 100) / 100;
+    const symbol = STATE_SYMBOLS[stateName] || '❔';
+    const fill = STATE_FILL[stateName] || 'grey';
+
+    let badge;
+    if (SHOW_METRICS.has(stateName)) {
+      badge = statusBadge.compose(
+        [`${mode}: ${symbol}`, `${pos}%`, `💨${flow}${flowUnit}`, `ΔP${deltaP} ${pressureUnit}`],
+        { fill, shape: 'dot' }
+      );
+    } else {
+      badge = statusBadge.compose([`${mode}: ${symbol}`], { fill, shape: 'dot' });
+    }
+
+    const fc = typeof host.getFluidCompatibility === 'function' ? host.getFluidCompatibility() : null;
+    if (fc && (fc.status === 'mismatch' || fc.status === 'conflict')) {
+      return { fill: 'yellow', shape: 'ring', text: `${badge.text} | ⚠ ${fc.message}` };
+    }
+    return badge;
+  } catch (err) {
+    host.logger?.error?.(`getStatusBadge: ${err.message}`);
+    return statusBadge.error('Status Error');
+  }
+}
+
+module.exports = { buildOutput, buildStatusBadge };

src/measurement/measurementRouter.js

@@ -0,0 +1,120 @@
+'use strict';
+
+// Routes incoming pressure/flow measurement updates and triggers the
+// hydraulic deltaP recompute. The formula path uses fixed FORMULA_UNITS
+// (mbar / m3/h / K) — the hydraulic model multiplies q^2 with rho * T
+// and divides by an absolute-pressure term, so unit choices are pinned.
+
+const FORMULA_UNITS = Object.freeze({ pressure: 'mbar', flow: 'm3/h', temperature: 'K' });
+
+class MeasurementRouter {
+  constructor(host) {
+    this.host = host;
+    this.logger = host.logger;
+  }
+
+  updatePressure(variant, value, position, unit) {
+    const h = this.host;
+    if (value === null || value === undefined) {
+      this.logger.warn(`Received null or undefined value for pressure update. Variant: ${variant}, Position: ${position}`);
+      return;
+    }
+    this.logger.debug(`Updating pressure: variant=${variant}, value=${value}, position=${position}`);
+    const u = unit || h.unitPolicyView.output.pressure;
+
+    if (variant === 'measured') {
+      h._writeMeasurement('pressure', 'measured', position, Number(value), u);
+      const downstreamP = h._readMeasurement('pressure', 'measured', 'downstream', FORMULA_UNITS.pressure);
+      const measuredFlow = h._readMeasurement('flow', 'measured', 'downstream', FORMULA_UNITS.flow);
+      const predictedFlow = h._readMeasurement('flow', 'predicted', 'downstream', FORMULA_UNITS.flow);
+      const activeFlow = Number.isFinite(predictedFlow) ? predictedFlow : measuredFlow;
+      this.updateDeltaP(activeFlow, h.kv, downstreamP);
+      return;
+    }
+    if (variant === 'predicted') {
+      h._writeMeasurement('pressure', 'predicted', position, Number(value), u);
+      const downstreamP = h._readMeasurement('pressure', 'predicted', 'downstream', FORMULA_UNITS.pressure);
+      const measuredFlow = h._readMeasurement('flow', 'measured', 'downstream', FORMULA_UNITS.flow);
+      const predictedFlow = h._readMeasurement('flow', 'predicted', 'downstream', FORMULA_UNITS.flow);
+      const activeFlow = Number.isFinite(predictedFlow) ? predictedFlow : measuredFlow;
+      this.updateDeltaP(activeFlow, h.kv, downstreamP);
+      return;
+    }
+    this.logger.warn(`Unrecognized variant '${variant}' for flow update.`);
+  }
+
+  updateFlow(variant, value, position, unit) {
+    const h = this.host;
+    if (value === null || value === undefined) {
+      this.logger.warn(`Received null or undefined value for flow update. Variant: ${variant}, Position: ${position}`);
+      return;
+    }
+    this.logger.debug(`Updating flow: variant=${variant}, value=${value}, position=${position}`);
+    const u = unit || h.unitPolicyView.output.flow;
+
+    if (variant === 'measured') {
+      h._writeMeasurement('flow', 'measured', position, Number(value), u);
+      const downstreamP = h._readMeasurement('pressure', 'measured', 'downstream', FORMULA_UNITS.pressure);
+      const measuredFlow = h._readMeasurement('flow', 'measured', position, FORMULA_UNITS.flow);
+      this.updateDeltaP(measuredFlow, h.kv, downstreamP);
+      return;
+    }
+    if (variant === 'predicted') {
+      h._writeMeasurement('flow', 'predicted', position, Number(value), u);
+      const downstreamP = h._readMeasurement('pressure', 'measured', 'downstream', FORMULA_UNITS.pressure);
+      const predictedFlow = h._readMeasurement('flow', 'predicted', position, FORMULA_UNITS.flow);
+      this.updateDeltaP(predictedFlow, h.kv, downstreamP);
+      return;
+    }
+    this.logger.warn(`Unrecognized variant '${variant}' for flow update.`);
+  }
+
+  updateMeasurement(variant, subType, value, position, unit) {
+    this.logger.debug(`---------------------- updating ${subType} ------------------ `);
+    switch (subType) {
+      case 'pressure':
+        this.updatePressure(variant, value, position, unit || this.host.unitPolicyView.output.pressure);
+        return;
+      case 'flow':
+        this.updateFlow(variant, value, position, unit || this.host.unitPolicyView.output.flow);
+        return;
+      case 'power':
+        return;
+      default:
+        this.logger.error(`Type '${subType}' not recognized for measured update.`);
+    }
+  }
+
+  // q in m3/h, downstreamP in mbar(g), temp in K
+  updateDeltaP(q, kv, downstreamP) {
+    const h = this.host;
+    const result = h.hydraulicModel.calculateDeltaPMbar({
+      qM3h: q, kv, downstreamGaugeMbar: downstreamP, rho: h.rho, tempK: h.T,
+    });
+    if (!result || !Number.isFinite(result.deltaPMbar)) return;
+    const deltaP = result.deltaPMbar;
+    h.deltaPKlep = deltaP;
+    h.hydraulicDiagnostics = result.details || null;
+    h._writeMeasurement('pressure', 'predicted', 'delta', deltaP, h.unitPolicyView.output.pressure);
+    this.logger.info('DeltaP updated to: ' + deltaP);
+    h.emitter.emit('deltaPChange', deltaP);
+    this.logger.info('DeltaPChange emitted to valveGroupController');
+  }
+
+  updatePositionDependent() {
+    const h = this.host;
+    const s = h.state.getCurrentState();
+    if (s !== 'operational' && s !== 'accelerating' && s !== 'decelerating') return;
+    this.logger.debug('Calculating new deltaP');
+    const x = h.state.getCurrentPosition();
+    const measuredFlow = h._readMeasurement('flow', 'measured', 'downstream', FORMULA_UNITS.flow);
+    const predictedFlow = h._readMeasurement('flow', 'predicted', 'downstream', FORMULA_UNITS.flow);
+    const currentFlow = Number.isFinite(predictedFlow) ? predictedFlow : measuredFlow;
+    const downstreamP = h._readMeasurement('pressure', 'measured', 'downstream', FORMULA_UNITS.pressure);
+    h.kv = h.curvePredictor.predictKvForPosition(x);
+    this.logger.debug(`Kv value for position valve ${x} is ${h.kv}`);
+    this.updateDeltaP(currentFlow, h.kv, downstreamP);
+  }
+}
+
+module.exports = { MeasurementRouter, FORMULA_UNITS };

src/nodeClass.js

@@ -1,341 +1,67 @@
-/**
- * Encapsulates all node logic in a reusable class. In future updates we can split this into multiple generic classes and use the config to specifiy which ones to use.
- * This allows us to keep the Node-RED node clean and focused on wiring up the UI and event handlers.
- */
-const { outputUtils, configManager, convert } = require('generalFunctions');
-const Specific = require("./specificClass");
+'use strict';
 
+const { BaseNodeAdapter, convert } = require('generalFunctions');
+const Valve = require('./specificClass');
+const commands = require('./commands');
 
-class nodeClass {
-  /**
-   * Create a MeasurementNode.
-   * @param {object} uiConfig - Node-RED node configuration.
-   * @param {object} RED    - Node-RED runtime API.
-   * @param {object} nodeInstance - The Node-RED node instance.
-   * @param {string} nameOfNode - The name of the node, used for
-   */
-  constructor(uiConfig, RED, nodeInstance, nameOfNode) {
+class nodeClass extends BaseNodeAdapter {
+  static DomainClass = Valve;
+  static commands = commands;
+  static tickInterval = null;
+  static statusInterval = 1000;
 
-    // Preserve RED reference for HTTP endpoints if needed
-    this.node = nodeInstance;
-    this.RED = RED;
-    this.name = nameOfNode;
-    this.source = null; // Will hold the specific class instance
-    this.config = null; // Will hold the merged configuration
+  buildDomainConfig(uiConfig) {
+    _rejectLegacyAssetFields(uiConfig);
 
-    // Load default & UI config
-    this._loadConfig(uiConfig,this.node);
-
-    // Instantiate core Measurement class
-    this._setupSpecificClass(uiConfig);
-
-    // Wire up event and lifecycle handlers
-    this._bindEvents();
-    this._registerChild();
-    this._startTickLoop();
-    this._attachInputHandler();
-    this._attachCloseHandler();
-  }
-
-  /**
-   * Load and merge default config with user-defined settings.
-   * @param {object} uiConfig - Raw config from Node-RED UI.
-   */
-  _loadConfig(uiConfig,node) {
-    // Resolve flow unit with validation before building config
-    const flowUnit = this._resolveUnitOrFallback(uiConfig.unit, 'volumeFlowRate', 'm3/h', 'flow');
-    const resolvedUiConfig = { ...uiConfig, unit: flowUnit };
-
-    // Build config: base sections handle general, asset, functionality
-    const cfgMgr = new configManager();
-    this.config = cfgMgr.buildConfig(this.name, resolvedUiConfig, node.id);
-
-    // Utility for formatting outputs
-    this._output = new outputUtils();
-  }
-
-  _resolveUnitOrFallback(candidate, expectedMeasure, fallbackUnit, label) {
-    const raw = typeof candidate === "string" ? candidate.trim() : "";
-    const fallback = String(fallbackUnit || "").trim();
-    if (!raw) {
-      return fallback;
-    }
-    try {
-      const desc = convert().describe(raw);
-      if (expectedMeasure && desc.measure !== expectedMeasure) {
-        throw new Error(`expected '${expectedMeasure}' but got '${desc.measure}'`);
-      }
-      return raw;
-    } catch (error) {
-      this.node?.warn?.(`Invalid ${label} unit '${raw}' (${error.message}). Falling back to '${fallback}'.`);
-      return fallback;
-    }
-  }
-
-  /**
-   * Instantiate the core logic and store as source.
-   */
-  _setupSpecificClass(uiConfig) {
-    const vconfig = this.config;
-    const asNumberOrUndefined = (value) => {
-      const parsed = Number(value);
-      return Number.isFinite(parsed) ? parsed : undefined;
-    };
-
-    // need extra state for this
-    const stateConfig = {
-        general: {
-          logging: {
-            enabled: vconfig.general.logging.enabled,
-            logLevel: vconfig.general.logging.logLevel
-          }
-        },
-        movement: {
-          speed: asNumberOrUndefined(uiConfig.speed)
-        },
+    const flowUnit = _resolveUnit(uiConfig.unit, 'volumeFlowRate', 'm3/h');
+    const asNum = (v) => { const n = Number(v); return Number.isFinite(n) ? n : undefined; };
+    Valve._pendingExtras = {
+      stateConfig: {
+        general: { logging: { enabled: uiConfig.enableLog, logLevel: uiConfig.logLevel } },
+        movement: { speed: asNum(uiConfig.speed) },
         time: {
-          starting: asNumberOrUndefined(uiConfig.startup),
-          warmingup: asNumberOrUndefined(uiConfig.warmup),
-          stopping: asNumberOrUndefined(uiConfig.shutdown),
-          coolingdown: asNumberOrUndefined(uiConfig.cooldown)
-        }
-      };
-
-    const runtimeOptions = {
-      serviceType: uiConfig.serviceType,
-      fluidDensity: asNumberOrUndefined(uiConfig.fluidDensity),
-      fluidTemperatureK: asNumberOrUndefined(uiConfig.fluidTemperatureK),
-      gasChokedRatioLimit: asNumberOrUndefined(uiConfig.gasChokedRatioLimit),
+          starting: asNum(uiConfig.startup), warmingup: asNum(uiConfig.warmup),
+          stopping: asNum(uiConfig.shutdown), coolingdown: asNum(uiConfig.cooldown),
+        },
+      },
+      runtimeOptions: {
+        serviceType: uiConfig.serviceType,
+        fluidDensity: asNum(uiConfig.fluidDensity),
+        fluidTemperatureK: asNum(uiConfig.fluidTemperatureK),
+        gasChokedRatioLimit: asNum(uiConfig.gasChokedRatioLimit),
+      },
+    };
+    return {
+      general: { unit: flowUnit },
+      asset: { model: uiConfig.model || null, unit: flowUnit },
     };
-
-    this.source = new Specific(vconfig, stateConfig, runtimeOptions);
-
-    //store in node 
-    this.node.source = this.source; // Store the source in the node instance for easy access
-  
-  }
-
-  /**
-   * Bind Measurement events to Node-RED status updates. Using internal emitter. --> REMOVE LATER WE NEED ONLY COMPLETE CHILDS AND THEN CHECK FOR UPDATES
-   */
-  _bindEvents() {
-
-  }
-
-  _updateNodeStatus() {
-    const v = this.source;
-
-    try {
-      const mode = v.currentMode;
-      const state = v.state.getCurrentState();
-      const fluidCompatibility = typeof v.getFluidCompatibility === "function"
-        ? v.getFluidCompatibility()
-        : null;
-      const fluidWarningText = (
-        fluidCompatibility
-        && (fluidCompatibility.status === "mismatch" || fluidCompatibility.status === "conflict")
-      )
-        ? fluidCompatibility.message
-        : "";
-      const flowUnit = v?.unitPolicy?.output?.flow || this.config.general.unit || "m3/h";
-      const pressureUnit = v?.unitPolicy?.output?.pressure || "mbar";
-      const flow = Math.round(v.measurements.type("flow").variant("predicted").position("downstream").getCurrentValue(flowUnit));
-
-      let deltaP = v.measurements.type("pressure").variant("predicted").position("delta").getCurrentValue(pressureUnit);
-      if (deltaP !== null) {
-        deltaP = parseFloat(deltaP.toFixed(0));
-      }
-      if(isNaN(deltaP)) {
-        deltaP = "∞";
-      }
-      const roundedPosition = Math.round(v.state.getCurrentPosition() * 100) / 100;
-      let symbolState;
-      switch(state){
-        case "off":
-          symbolState = "⬛";
-          break;
-        case "idle":
-          symbolState = "⏸️";
-          break;
-        case "operational":
-          symbolState = "⏵️";
-          break;
-        case "starting":
-          symbolState = "⏯️";
-          break;
-        case "warmingup":
-          symbolState = "🔄";
-          break;
-        case "accelerating":
-          symbolState = "⏩";
-          break;
-        case "stopping":
-          symbolState = "⏹️";
-          break;
-        case "coolingdown":
-          symbolState = "❄️";
-          break;
-        case "decelerating":
-          symbolState = "⏪";
-          break;
-      }
-
-      let status;
-      switch (state) {
-        case "off":
-          status = { fill: "red", shape: "dot", text: `${mode}: OFF` };
-          break;
-        case "idle":
-          status = { fill: "blue", shape: "dot", text: `${mode}: ${symbolState}` };
-          break;
-        case "operational":
-          status = { fill: "green", shape: "dot", text: `${mode}: ${symbolState} | ${roundedPosition}% | 💨${flow}${flowUnit} | ΔP${deltaP} ${pressureUnit}`};
-          break;
-        case "starting":
-          status = { fill: "yellow", shape: "dot", text: `${mode}: ${symbolState}` };
-          break;
-        case "warmingup":
-          status = { fill: "green", shape: "dot", text: `${mode}: ${symbolState} | ${roundedPosition}% | 💨${flow}${flowUnit} | ΔP${deltaP} ${pressureUnit}`};
-          break;
-        case "accelerating":
-          status = { fill: "yellow", shape: "dot", text: `${mode}: ${symbolState} | ${roundedPosition}% | 💨${flow}${flowUnit} | ΔP${deltaP} ${pressureUnit}` };
-          break;
-        case "stopping":
-          status = { fill: "yellow", shape: "dot", text: `${mode}: ${symbolState}` };
-          break;
-        case "coolingdown":
-          status = { fill: "yellow", shape: "dot", text: `${mode}: ${symbolState}` };
-          break;
-        case "decelerating":
-          status = { fill: "yellow", shape: "dot", text: `${mode}: ${symbolState} - ${roundedPosition}% | 💨${flow}${flowUnit} | ΔP${deltaP} ${pressureUnit}`};
-          break;
-        default:
-          status = { fill: "grey", shape: "dot", text: `${mode}: ${symbolState}` };
-      }
-      if (fluidWarningText) {
-        status = {
-          fill: "yellow",
-          shape: "ring",
-          text: `${status.text} | ⚠ ${fluidWarningText}`,
-        };
-      }
-      return status;
-    } catch (error) {
-      this.node.error("Error in updateNodeStatus: " + error.message);
-      return { fill: "red", shape: "ring", text: "Status Error" };
-    }
-  }
-
-  /**
-   * Register this node as a child upstream and downstream.
-   * Delayed to avoid Node-RED startup race conditions.
-   */
-  _registerChild() {
-    setTimeout(() => {
-      this.node.send([
-        null,
-        null,
-        { topic: 'registerChild', payload: this.node.id , positionVsParent: this.config?.functionality?.positionVsParent || 'atEquipment' },
-      ]);
-    }, 100);
-  }
-
-  /**
-   * Start the periodic tick loop.
-   */
-  _startTickLoop() {
-    setTimeout(() => {
-      this._tickInterval = setInterval(() => this._tick(), 1000);
-
-      // Update node status on nodered screen every second ( this is not the best way to do this, but it works for now)
-      this._statusInterval = setInterval(() => {
-        const status = this._updateNodeStatus();
-        this.node.status(status);
-      }, 1000);
-
-    }, 1000);
-  }
-
-  /**
-   * Execute a single tick: update measurement, format and send outputs.
-   */
-  _tick() {
-    //this.source.tick();
-
-    const raw = this.source.getOutput();
-    const processMsg = this._output.formatMsg(raw, this.source.config, 'process');
-    const influxMsg  = this._output.formatMsg(raw, this.source.config, 'influxdb');
-
-    // Send only updated outputs on ports 0 & 1
-    this.node.send([processMsg, influxMsg]);
-  }
-
-  /**
-   * Attach the node's input handler, routing control messages to the class.
-   */
-  _attachInputHandler() {
-    this.node.on('input', (msg, send, done) => {
-      const v = this.source;
-      try {
-        switch(msg.topic) {
-          case 'registerChild': {
-            const childId = msg.payload;
-            const childObj = this.RED.nodes.getNode(childId);
-            if (!childObj || !childObj.source) {
-              v.logger.warn(`registerChild skipped: missing child/source for id=${childId}`);
-              break;
-            }
-            v.childRegistrationUtils.registerChild(childObj.source, msg.positionVsParent);
-            break;
-          }
-          case 'setMode':
-            v.setMode(msg.payload);
-            break;
-          case 'execSequence': {
-            const { source: seqSource, action: seqAction, parameter } = msg.payload;
-            v.handleInput(seqSource, seqAction, parameter);
-            break;
-          }
-          case 'execMovement': {
-            const { source: mvSource, action: mvAction, setpoint } = msg.payload;
-            v.handleInput(mvSource, mvAction, Number(setpoint));
-            break;
-          }
-          case 'emergencystop':
-          case 'emergencyStop': {
-            const payload = msg.payload || {};
-            const esSource = payload.source || 'parent';
-            v.handleInput(esSource, 'emergencystop');
-            break;
-          }
-          case 'showcurve':
-            send({ topic: 'Showing curve', payload: v.showCurve() });
-            break;
-          case 'updateFlow':
-            v.updateFlow(msg.payload.variant, msg.payload.value, msg.payload.position, msg.payload.unit || this.config.general.unit);
-            break;
-          default:
-            v.logger.warn(`Unknown topic: ${msg.topic}`);
-        }
-      } catch (error) {
-        v.logger.error(`Input handler failure: ${error.message}`);
-      }
-
-      if (typeof done === 'function') done();
-    });
-  }
-
-  /**
-   * Clean up timers and intervals when Node-RED stops the node.
-   */
-  _attachCloseHandler() {
-    this.node.on('close', (done) => {
-      clearInterval(this._tickInterval);
-      clearInterval(this._statusInterval);
-      this.source?.destroy?.();
-      if (typeof done === 'function') done();
-    });
   }
 }
 
+// See rotatingMachine/src/nodeClass.js for the rationale. Same cutover rule.
+function _rejectLegacyAssetFields(uiConfig) {
+  const offenders = ['supplier', 'category', 'assetType'].filter((k) => {
+    const v = uiConfig[k];
+    return typeof v === 'string' && v.trim() !== '';
+  });
+  if (offenders.length > 0) {
+    throw new Error(
+      `valve: legacy asset field(s) [${offenders.join(', ')}] are saved on this node. ` +
+      `After the AssetResolver refactor these are derived from the model id. ` +
+      `Open the node in the editor, re-select the model, and save to migrate.`,
+    );
+  }
+}
+
+function _resolveUnit(candidate, expectedMeasure, fallback) {
+  const raw = typeof candidate === 'string' ? candidate.trim() : '';
+  const fb = String(fallback || '').trim();
+  if (!raw) return fb;
+  try {
+    const desc = convert().describe(raw);
+    if (expectedMeasure && desc.measure !== expectedMeasure) return fb;
+    return raw;
+  } catch (_) { return fb; }
+}
+
 module.exports = nodeClass;

src/state/stateBindings.js

@@ -0,0 +1,17 @@
+'use strict';
+
+// Bind the underlying state machine's positionChange event to the host's
+// updatePosition() hook. Returns an unbind function for clean teardown.
+
+function bindStateEvents({ state, onPositionChange }) {
+  const handler = (data) => onPositionChange?.(data);
+  state.emitter.on('positionChange', handler);
+  return () => {
+    if (typeof state.emitter.off === 'function') state.emitter.off('positionChange', handler);
+    else if (typeof state.emitter.removeListener === 'function') {
+      state.emitter.removeListener('positionChange', handler);
+    }
+  };
+}
+
+module.exports = { bindStateEvents };

valve.html

@@ -25,11 +25,11 @@
       processOutputFormat: { value: "process" },
       dbaseOutputFormat: { value: "influxdb" },
       
-      //define asset properties
+      // Asset identifier surface. supplier/category/assetType are derived
+      // at runtime via assetResolver.resolveAssetMetadata(model). Do NOT
+      // add them back here. See generalFunctions/src/registry/README.md.
       uuid: { value: "" },
-      supplier: { value: "" },
-      category: { value: "" },
-      assetType: { value: "" },
+      assetTagNumber: { value: "" },
       model: { value: "" },
       unit: { value: "" },
 
@@ -54,7 +54,10 @@
     icon: "font-awesome/fa-toggle-on",
 
     label: function () {
-      return (this.positionIcon || "") + " " + (this.category ? this.category.slice(0, -1) : "Valve");
+      // No more `this.category` on the node — derive from the model if needed,
+      // else fall back to a generic name.
+      const stem = this.model ? this.model : "Valve";
+      return (this.positionIcon || "") + " " + stem;
     },
     
     oneditprepare: function() {

wiki/Home.md

@@ -0,0 +1,134 @@
+# valve
+
+![code-ref](https://img.shields.io/badge/code--ref-8c2b2c0-blue) ![s88](https://img.shields.io/badge/S88-Equipment_Module-86bbdd) ![status](https://img.shields.io/badge/status-pending--review-orange)
+
+A `valve` models a single actuated throttling valve. It loads a supplier Kv-vs-position characteristic curve, drives a position FSM (`accelerating` / `decelerating` through `operational`), and recomputes pressure drop from flow + Kv via a hydraulic model that picks a liquid or gas formula by `serviceType`. Used standalone, or as a child of `valveGroupControl`, downstream of a `rotatingMachine` / `machineGroupControl` / `pumpingStation`.
+
+> [!NOTE]
+> Pending full node review (2026-05). Content reflects `CONTRACT.md` and current source only.
+
+---
+
+## At a glance
+
+| Thing | Value |
+|:---|:---|
+| What it represents | One actuated throttling valve — supplier Kv curve, position FSM, deltaP estimate |
+| S88 level | Equipment Module |
+| Use it when | You need a position-controlled valve whose deltaP depends on flow, Kv(position), and service-type (gas / liquid) |
+| Don't use it for | Fixed-restriction orifices, non-return / check valves, or curveless throttling devices (no fallback model) |
+| Children it accepts | Upstream sources (`rotatingmachine`, `machinegroup` / `machinegroupcontrol`, `pumpingstation`, `valvegroupcontrol`) for fluid-contract tracking; `measurement` for pressure / flow |
+| Parents it talks to | `valveGroupControl` (typical) or any node that issues `set.position` / `cmd.startup` / `cmd.shutdown` |
+
+---
+
+## How it fits
+
+```mermaid
+flowchart LR
+    parent[valveGroupControl]:::unit -->|set.position<br/>cmd.startup / shutdown| v[valve<br/>Equipment]:::equip
+    src["rotatingMachine /<br/>MGC / pumpingStation"]:::unit -->|child.register<br/>(fluid contract)| v
+    m_p[measurement<br/>pressure]:::ctrl -.measured.-> v
+    m_f[measurement<br/>flow]:::ctrl -.measured.-> v
+    v -->|child.register| parent
+    v -.->|evt.deltaPChange<br/>evt.fluidCompatibilityChange<br/>evt.fluidContractChange| parent
+    classDef unit fill:#50a8d9,color:#000
+    classDef equip fill:#86bbdd,color:#000
+    classDef ctrl fill:#a9daee,color:#000
+```
+
+S88 colours are anchored in `.claude/rules/node-red-flow-layout.md`.
+
+---
+
+## Try it &mdash; 3-minute demo
+
+Import the basic example flow, deploy, and drive a single valve through a position move.
+
+```bash
+curl -X POST -H 'Content-Type: application/json' \
+  --data @nodes/valve/examples/basic.flow.json \
+  http://localhost:1880/flow
+```
+
+> [!NOTE]
+> The shipped `examples/{basic,integration,edge}.flow.json` files are minimal stubs (one inject &rarr; valve &rarr; debug). A tiered `01 - Basic Manual Control.json` / `02 - Integration with Valve Group.json` / `03 - Dashboard Visualization.json` set, matching the `rotatingMachine` template, is on the backlog. Until then, drive the node directly with injects.
+
+What to send after deploy (the topics map one-to-one to entries in [Reference &mdash; Contracts](Reference-Contracts#topic-contract)):
+
+1. `set.mode = virtualControl` &mdash; lets the GUI source drive the valve (parent path is for grouped use).
+2. `cmd.startup` &mdash; FSM runs `idle &rarr; starting &rarr; warmingup &rarr; operational`.
+3. `set.position = {setpoint: 60}` (position %) &mdash; valve ramps from 0 to 60; state goes `operational &rarr; accelerating &rarr; operational`. Each position tick fires a Kv lookup + deltaP recompute.
+4. `data.flow = {variant: 'measured', value: 25, position: 'downstream', unit: 'm3/h'}` &mdash; push flow so the hydraulic model has something to chew on. `delta_predicted_pressure` updates and `evt.deltaPChange` fires upward.
+5. `cmd.shutdown` &mdash; if currently `operational`, the controller first ramps to position 0, then transitions `stopping &rarr; coolingdown &rarr; idle`.
+
+> [!IMPORTANT]
+> **GIF needed.** Demo recording of steps 1&ndash;5 with the live status badge. Save as `wiki/_partial-gifs/valve/01-basic-demo.gif`, target &le; 1&nbsp;MB after `gifsicle -O3 --lossy=80`.
+
+---
+
+## The seven things you'll send
+
+| Topic | Aliases | Payload | What it does |
+|:---|:---|:---|:---|
+| `set.mode` | `setMode` | `"auto"` \| `"virtualControl"` \| `"fysicalControl"` \| `"maintenance"` | Switch operational mode. Source allow-list per mode (defaults from `valve.json`). |
+| `cmd.startup` | &mdash; | `{ source?: string }` | Run the configured `startup` sequence (default `[starting, warmingup, operational]`). |
+| `cmd.shutdown` | &mdash; | `{ source?: string }` | Run `shutdown`. If currently `operational`, first ramps the valve to position 0, then transitions `stopping &rarr; coolingdown &rarr; idle`. |
+| `cmd.estop` | `emergencystop`, `emergencyStop` | `{ source?: string, action?: string }` | Trigger an emergency stop &mdash; runs the `emergencystop` sequence (default `[emergencystop, off]`). |
+| `set.position` | `execMovement` | `{ source?: string, action?: string, setpoint: number }` | Move the valve to a position (control-%, `0..100`). Setpoint is coerced to `Number`. |
+| `data.flow` | `updateFlow` | `{ variant, value, position, unit? }` &mdash; `variant ∈ {'measured','predicted'}` | Push a flow measurement; triggers a Kv lookup + deltaP recompute via the hydraulic model. |
+| `query.curve` | `showcurve` | any | Reply on Port 0 with `{ topic: 'Showing curve', payload: <curve snapshot> }`. |
+
+Plus the registration topic emitted upward at startup and accepted from real `measurement` children:
+
+| Topic | Aliases | Payload |
+|:---|:---|:---|
+| `child.register` | `registerChild` | child Node-RED id (string); `msg.positionVsParent` carries the position label |
+
+The legacy umbrella `execSequence` (`{action: 'startup' \| 'shutdown' \| 'emergencystop'}`) is still accepted &mdash; it forwards to the canonical `cmd.*` handler and logs a one-time deprecation warning. Scheduled for removal in Phase 7.
+
+---
+
+## What you'll see come out
+
+Sample Port 0 message (delta-compressed, while operational at ~60 % open with a 25 m³/h flow):
+
+```json
+{
+  "topic": "valve#valve_a",
+  "payload": {
+    "state": "operational",
+    "percentageOpen": 60,
+    "moveTimeleft": 0,
+    "mode": "auto",
+    "downstream_measured_flow": 25,
+    "downstream_predicted_flow": 0,
+    "delta_predicted_pressure": 84
+  }
+}
+```
+
+Key shape: **`<position>_<variant>_<type>`** &mdash; the legacy three-segment shape. Position labels are lowercase (`downstream`, `delta`, `upstream`). `valve` does **not** use the four-segment `<type>.<variant>.<position>.<childId>` shape that `rotatingMachine` emits.
+
+| Field | Meaning |
+|:---|:---|
+| `state` | Current FSM state. See [Architecture &mdash; FSM](Reference-Architecture#fsm). |
+| `percentageOpen` | Current position (`0..100`). 0 = closed, 100 = fully open. |
+| `moveTimeleft` | Seconds remaining on the current position move (0 when stationary). |
+| `mode` | One of `auto` / `virtualControl` / `fysicalControl` / `maintenance`. |
+| `delta_predicted_pressure` | Predicted deltaP across the valve (output unit `mbar`). |
+| `downstream_predicted_flow` / `_measured_flow` | Last flow pushed via `data.flow` (output unit `m3/h`). |
+| `downstream_measured_pressure` / `_predicted_pressure` | Pressure measurements pushed via the `MeasurementRouter`. |
+
+---
+
+## Need more?
+
+| Page | What you'll find |
+|:---|:---|
+| [Reference &mdash; Contracts](Reference-Contracts) | Full topic contract, config schema, child registration filters |
+| [Reference &mdash; Architecture](Reference-Architecture) | Code map, FSM, hydraulic model, lifecycle |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped example flows + debug recipes |
+| [Reference &mdash; Limitations](Reference-Limitations) | When not to use, known limitations, open questions |
+
+[EVOLV master wiki](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Home) &middot; [Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns) &middot; [Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions)

wiki/Reference-Architecture.md

@@ -0,0 +1,300 @@
+# Reference — Architecture
+
+![code-ref](https://img.shields.io/badge/code--ref-8c2b2c0-blue)
+
+> [!NOTE]
+> Code structure for `valve`: the three-tier sandwich, the `src/` layout, the position FSM, the hydraulic-model pipeline, the lifecycle, and the output ports. For an intuitive overview, return to [Home](Home).
+>
+> Pending full node review (2026-05). Content reflects `CONTRACT.md` and current source only.
+
+---
+
+## Three-tier code layout
+
+```
+nodes/valve/
+|
++-- valve.js                       entry: RED.nodes.registerType('valve', NodeClass)
+|
++-- src/
+|     nodeClass.js                 extends BaseNodeAdapter (Node-RED bridge)
+|     specificClass.js             extends BaseDomain (orchestration only)
+|     hydraulicModel.js            ValveHydraulicModel + normalizeServiceType
+|     |
+|     +-- commands/
+|     |     index.js               topic descriptors
+|     |     handlers.js            pure handler functions
+|     |
+|     +-- curve/
+|     |     supplierCurve.js       SupplierCurvePredictor (Kv-vs-position load + interp)
+|     |
+|     +-- fluid/
+|     |     fluidCompatibility.js  FluidCompatibility — upstream service-type aggregation
+|     |
+|     +-- measurement/
+|     |     measurementRouter.js   MeasurementRouter + FORMULA_UNITS
+|     |
+|     +-- flow/
+|     |     flowController.js      handleInput, executeSequence, setpoint (pre-shutdown ramp)
+|     |
+|     +-- state/
+|     |     stateBindings.js       wires state.emitter('positionChange') → updatePosition()
+|     |
+|     +-- io/
+|           output.js              buildOutput + buildStatusBadge
+```
+
+### Tier responsibilities
+
+| Tier | File | What it owns | Touches `RED.*` |
+|:---|:---|:---|:---:|
+| entry | `valve.js` | Type registration | Yes |
+| nodeClass | `src/nodeClass.js` | UI-config → domain config, legacy-asset-field reject, status-badge polling (`statusInterval=1000`). No tick loop (`tickInterval=null`) — event-driven. | Yes |
+| specificClass | `src/specificClass.js` | Wire concern modules in `configure()`; expose the public surface tests + parents (VGC) depend on (`handleInput`, `setMode`, `updatePosition`, `updateFlow`, `updatePressure`, `registerChild`, `showCurve`, `getOutput`, …). Overrides `BaseDomain.registerChild` so upstream-source registration falls into `FluidCompatibility` instead of the generic ChildRouter. | No |
+
+`specificClass` is stitching. All real work lives in the concern modules: position bindings in `state/`, deltaP math in `hydraulicModel.js`, Kv interpolation in `curve/`, measurement → deltaP plumbing in `measurement/`, mode + sequences in `flow/`, fluid contract aggregation in `fluid/`, and Port-0 shaping in `io/`.
+
+---
+
+## FSM
+
+> [!NOTE]
+> The state machine is declared in `generalFunctions/src/state/stateConfig.json`. Same allowed-transition graph as `rotatingMachine`, with `accelerating` / `decelerating` reused for position moves up / down.
+
+```mermaid
+stateDiagram-v2
+    [*] --> idle
+    idle --> starting: cmd.startup
+    idle --> off
+    idle --> maintenance
+    starting --> warmingup: timer (time.starting)
+    warmingup --> operational: timer (time.warmingup) [protected]
+    operational --> accelerating: set.position up
+    operational --> decelerating: set.position down
+    operational --> stopping: cmd.shutdown
+    accelerating --> operational: target reached
+    decelerating --> operational: target reached
+    stopping --> coolingdown: timer (time.stopping)
+    coolingdown --> idle: timer (time.coolingdown) [protected]
+    coolingdown --> off
+    off --> idle: boot
+    off --> maintenance
+    maintenance --> off
+    maintenance --> idle
+
+    note right of operational
+        any state -> emergencystop via cmd.estop
+        from emergencystop: idle / off / maintenance
+    end note
+```
+
+Default sequences (from `valve.json`):
+
+| Sequence | States |
+|:---|:---|
+| `startup` | `[starting, warmingup, operational]` |
+| `shutdown` | `[stopping, coolingdown, idle]` |
+| `emergencystop` | `[emergencystop, off]` |
+| `boot` | `[idle, starting, warmingup, operational]` |
+
+### Pre-shutdown ramp to zero
+
+`FlowController.executeSequence('shutdown')` checks the FSM. When the valve is `operational` it first calls `setpoint(0)` — the position-ramp to fully closed is interruptible — then iterates the sequence states.
+
+### Protected states
+
+`warmingup` and `coolingdown` are **protected** at the state-machine layer (same mechanism as `rotatingMachine`). Aborts during these phases are ignored to preserve safety guarantees.
+
+> [!NOTE]
+> Whether `valve` adopts the `sequenceAbortToken` mechanism from `rotatingMachine` (2026-05-15) for mid-shutdown re-engage races is an open question. TODO: confirm from `generalFunctions/src/state/state.js` whether valve inherits the token automatically. Source: `nodes/valve/src/flow/flowController.js`.
+
+### Position-move bindings
+
+`src/state/stateBindings.js` wires the underlying state machine's `positionChange` event to `host.updatePosition()`. Every position tick triggers:
+
+1. `host.kv = host.curvePredictor.predictKvForPosition(x)` — Kv lookup against the supplier curve.
+2. `MeasurementRouter.updateDeltaP(currentFlow, kv, downstreamP)` — recompute the hydraulic deltaP and write `pressure.predicted.delta`.
+3. `host.emitter.emit('deltaPChange', deltaP)` — upward to the parent VGC.
+
+`updatePosition()` is a no-op outside of `operational` / `accelerating` / `decelerating` (see `MeasurementRouter.updatePositionDependent`).
+
+---
+
+## Hydraulic + measurement pipeline
+
+```mermaid
+flowchart TB
+    set[set.position]:::input --> fc[FlowController.setpoint]
+    fc --> moveTo[state.moveTo]
+    moveTo --> tick[state.emitter 'positionChange']
+    tick --> upd[updatePosition]
+    upd --> kv[curvePredictor.predictKvForPosition]
+    fdat[data.flow]:::input --> mr[MeasurementRouter.updateFlow]
+    fpres[measurement child<br/>pressure.measured.*]:::input --> mp[MeasurementRouter.updatePressure]
+    mr --> dp[updateDeltaP]
+    mp --> dp
+    kv --> dp
+    dp --> hyd[ValveHydraulicModel<br/>calculateDeltaPMbar]
+    hyd --> write[write pressure.predicted.delta]
+    write --> emit[emitter 'deltaPChange']
+    write --> out[Port 0]
+    classDef input fill:#a9daee,color:#000
+```
+
+### Curve loading
+
+At `configure()` startup:
+
+1. `assetResolver.resolveAssetMetadata('valve', model)` resolves supplier / type / allowed units from `generalFunctions/datasets/assetData/` &mdash; **may return null** for valve; the predictor tolerates an inline `asset.valveCurve` fallback.
+2. `SupplierCurvePredictor` is constructed with the model, the inline curve override, density, temperature, and valve diameter.
+3. `predictKv` (the curve-evaluation function) is exposed on the host; `host.curveSelection` records which `(densityKey, diameterKey)` lane of the dataset is in use.
+
+The `asset.valveCurve` schema is a nested map keyed by gas-density (kg per nm³) and valve diameter (mm); the leaf carries `{x: [position%], y: [Kv (m³/h)]}` lookup tables.
+
+### Hydraulic formula selection
+
+`ValveHydraulicModel.calculateDeltaPMbar` picks one of two formulas by `serviceType`:
+
+| serviceType | Formula | Notes |
+|:---|:---|:---|
+| `liquid` | `deltaP_bar = (Q / Kv)^2 * (rho / 1000)` | Density override via `runtimeOptions.fluidDensity` (default 997 kg/m³). |
+| `gas` | `deltaP_bar = (Q^2 * rho * T) / (514^2 * Kv^2 * P2_abs)` | Density (default 1.204), absolute downstream pressure, temperature K. Capped at `gasChokedRatioLimit * P2_abs` when choked. |
+
+Inputs are validated: `kv > 0`, `flow !== 0`, and (for gas) a finite downstream gauge pressure are required &mdash; otherwise the function returns `null` and the router skips the write.
+
+### Formula units are pinned
+
+`measurement/measurementRouter.js` declares:
+
+```js
+const FORMULA_UNITS = Object.freeze({ pressure: 'mbar', flow: 'm3/h', temperature: 'K' });
+```
+
+The hydraulic model expects q in m³/h, downstream gauge in mbar, and T in K. The router reads MeasurementContainer values back in these units before calling `calculateDeltaPMbar` regardless of the per-node `unitPolicy.output.*` rendering choices.
+
+### Unit policy
+
+Source: `src/specificClass.js` lines 20&ndash;24.
+
+| Quantity | Canonical (internal) | Output (rendered) | Required-unit |
+|:---|:---|:---|:---:|
+| Pressure | `Pa` | `mbar` | ✓ |
+| Flow | `m3/s` | `m3/h` | ✓ |
+| Temperature | `K` | `C` | ✓ |
+
+`requireUnitForTypes` means MeasurementContainer rejects writes that omit `unit` for these types.
+
+---
+
+## Lifecycle &mdash; what one event does
+
+```mermaid
+sequenceDiagram
+    autonumber
+    participant parent as VGC / GUI
+    participant v as valve
+    participant fc as flowController
+    participant fsm as state (FSM)
+    participant hyd as hydraulicModel
+    participant out as Port 0 / parent
+
+    parent->>v: set.position {setpoint: 60}
+    v->>fc: flowController.handleInput('parent','execMovement', 60)
+    fc->>fc: isValidSourceForMode check
+    fc->>fsm: setpoint(60) → state.moveTo(60)
+    fsm-->>v: positionChange events per move tick
+    v->>v: kv = curvePredictor.predictKvForPosition(pos)
+    v->>hyd: calculateDeltaPMbar(q, kv, downP, rho, T)
+    hyd-->>v: { deltaPMbar, details }
+    v->>v: write pressure.predicted.delta
+    v->>parent: emitter.emit('deltaPChange', deltaP)
+    v->>out: notifyOutputChanged (Port 0 delta)
+    parent->>v: data.flow {variant, value, position, unit}
+    v->>v: MeasurementRouter.updateFlow → updateDeltaP
+```
+
+### Mode + source allow-lists
+
+Each input is gated in `flowController.handleInput`:
+
+```js
+if (!this.isValidSourceForMode(source, this.host.currentMode)) {
+    this.logger.warn(`Source '${source}' is not valid for mode '${currentMode}'.`);
+    return { status: false, feedback: msg };
+}
+```
+
+Defaults (per `valve.json` `mode.allowedSources`):
+
+| Mode | Allowed sources |
+|:---|:---|
+| `auto` | `parent, GUI, fysical` |
+| `virtualControl` | `GUI, fysical` |
+| `fysicalControl` | `fysical` |
+| `maintenance` | _(no entry &mdash; no source accepted; only `statusCheck` action allowed)_ |
+
+A rejected request logs at warn and short-circuits.
+
+> [!NOTE]
+> Unlike `rotatingMachine`, `valve`'s `flowController` does not currently gate by `allowedActions` &mdash; only by source. The schema defines `mode.allowedActions` but it isn't enforced in `flowController.handleInput`. TODO: confirm intentional or backlog. Source: `nodes/valve/src/flow/flowController.js` lines 18&ndash;24.
+
+---
+
+## Output ports
+
+| Port | Carries | Sample shape |
+|:---|:---|:---|
+| 0 (process) | Delta-compressed state snapshot &mdash; FSM state, position %, mode, every populated MeasurementContainer slot | `{topic, payload: {state, percentageOpen, moveTimeleft, mode, delta_predicted_pressure, downstream_measured_flow, ...}}` |
+| 1 (telemetry) | InfluxDB line-protocol payload (same fields as Port 0) | `valve,id=valve_a state="operational",percentageOpen=60,delta_predicted_pressure=84,...` |
+| 2 (register / control) | `child.register` upward at startup; `positionVsParent` and optional `distance` carried on the msg | `{topic: 'child.register', payload: <node.id>, positionVsParent, distance}` |
+
+Port-0 key shape is **`<position>_<variant>_<type>`** (legacy three-segment). Examples: `delta_predicted_pressure`, `downstream_measured_flow`, `downstream_predicted_pressure`. Only keys with finite values are emitted &mdash; consumers must cache and merge.
+
+On `query.curve` the node additionally emits `{topic: 'Showing curve', payload: <SupplierCurvePredictor.snapshot()>}` synchronously on Port 0.
+
+See [EVOLV &mdash; Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry) for the full InfluxDB layout.
+
+---
+
+## Event sources
+
+| Source | Where it fires | What it triggers |
+|:---|:---|:---|
+| `state.emitter` `'positionChange'` | `movementManager` during a position move | `updatePosition()` &mdash; Kv lookup, deltaP recompute, Port 0 |
+| `state.emitter` `'stateChange'` | `stateManager.transitionTo` resolve | Logged; `getOutput()` picks up the new `state` value on the next tick |
+| `source.emitter` `'deltaPChange'` | `MeasurementRouter.updateDeltaP` after a finite deltaP | Consumed by `valveGroupControl` to update group totals |
+| `source.emitter` `'fluidCompatibilityChange'` | `FluidCompatibility` on upstream-source contract change | Consumed by parent for service-type aggregation |
+| `source.emitter` `'fluidContractChange'` | `FluidCompatibility` when the contract this valve advertises downstream changes | Consumed by downstream consumers |
+| `source.measurements.emitter` `'<type>.<variant>.<position>'` | MeasurementContainer write | Generic handshake; parents subscribe via `child.measurements.emitter.on` |
+| Inbound `msg.topic` | Node-RED input wire | `commandRegistry` dispatch |
+| `setInterval(statusInterval = 1000)` | `BaseNodeAdapter` | Status badge re-render |
+
+No per-second tick on the domain itself. Position moves drive their own animation interval inside `movementManager`.
+
+---
+
+## Where to start reading
+
+| If you're changing... | Read first |
+|:---|:---|
+| Kv curve load / inline-curve fallback | `src/curve/supplierCurve.js` |
+| Liquid / gas deltaP math, choke cap | `src/hydraulicModel.js` |
+| Measurement &rarr; deltaP plumbing (when a recompute fires) | `src/measurement/measurementRouter.js` |
+| Position-tick &rarr; updatePosition wiring | `src/state/stateBindings.js` |
+| Mode allow-list, setpoint, executeSequence, pre-shutdown ramp | `src/flow/flowController.js` |
+| Upstream-source fluid tracking, contract aggregation | `src/fluid/fluidCompatibility.js` |
+| `query.curve` reply / status badge / Port 0 shape | `src/io/output.js` |
+| Topic registration, payload validation, aliases | `src/commands/{index, handlers}.js` |
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference &mdash; Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped flows + debug recipes |
+| [Reference &mdash; Limitations](Reference-Limitations) | Known issues and open questions |
+| [valveGroupControl wiki](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Home) | The grouped-control parent |
+| [EVOLV &mdash; Architecture](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Architecture) | Platform-wide three-tier pattern |

wiki/Reference-Contracts.md

@@ -0,0 +1,254 @@
+# Reference — Contracts
+
+![code-ref](https://img.shields.io/badge/code--ref-8c2b2c0-blue)
+
+> [!NOTE]
+> Full topic contract, configuration schema, and child-registration filters for `valve`. Source of truth: `src/commands/index.js`, `src/specificClass.js` `configure()`, and the schema at `generalFunctions/src/configs/valve.json`.
+>
+> Pending full node review (2026-05). Content reflects `CONTRACT.md` and current source only. For an intuitive overview, return to the [Home](Home).
+
+---
+
+## Topic contract
+
+The registry lives in `src/commands/index.js`. Each descriptor maps a canonical `msg.topic` to its handler; aliases emit a one-time deprecation warning the first time they fire.
+
+<!-- BEGIN AUTOGEN: topic-contract -->
+
+| Canonical topic | Aliases | Payload | Unit | Effect |
+|---|---|---|---|---|
+| `set.mode` | `setMode` | `string` | — | Switch the operating mode. Allowed: `auto`, `virtualControl`, `fysicalControl`, `maintenance` (schema-validated in `valve.json` → `mode.current`). |
+| `cmd.startup` | — | any | — | Initiate the valve startup sequence. |
+| `cmd.shutdown` | — | any | — | Initiate the valve shutdown sequence. |
+| `cmd.estop` | `emergencystop`, `emergencyStop` | any | — | Trigger an emergency stop on the valve. |
+| `execSequence` | — | `object` | — | Legacy umbrella that demuxes payload.action to startup / shutdown / estop. |
+| `set.position` | `execMovement` | `object` | — | Move the valve to a control-% position via execMovement. |
+| `data.flow` | `updateFlow` | `object` | — | Push a measured flow into the valve (variant + position + unit). |
+| `query.curve` | `showcurve` | any | — | Return the valve characteristic curve on the reply port. |
+| `child.register` | `registerChild` | `string` | — | Register a child measurement with this valve. |
+
+<!-- END AUTOGEN: topic-contract -->
+
+### `execSequence` demux
+
+The pre-refactor topic `execSequence` carried `{source, action, parameter}` where `action` selected the verb. The command registry does not natively dispatch by payload content, so `execSequence` keeps its own descriptor whose handler forwards directly to the canonical `cmd.startup` / `cmd.shutdown` / `cmd.estop` handler based on `payload.action`. A deprecation warning fires once. Future-Phase-7 removal of `execSequence` is a behavioural change &mdash; callers must migrate to the canonical topics.
+
+### Mode / source allow-lists
+
+A topic that survives the registry still passes through `flowController.handleInput`:
+
+```js
+if (!this.isValidSourceForMode(source, this.host.currentMode)) {
+    this.logger.warn(`Source '${source}' is not valid for mode '${currentMode}'.`);
+    return { status: false, feedback: msg };
+}
+```
+
+Defaults from `valve.json`:
+
+| Mode | `allowedSources` | `allowedActions` (schema) |
+|:---|:---|:---|
+| `auto` | `parent, GUI, fysical` | `statusCheck, execMovement, execSequence, emergencyStop` |
+| `virtualControl` | `GUI, fysical` | `statusCheck, execMovement, execSequence, emergencyStop` |
+| `fysicalControl` | `fysical` | `statusCheck, emergencyStop` |
+| `maintenance` | _(none)_ | `statusCheck` |
+
+> [!NOTE]
+> `flowController.handleInput` currently enforces only the source side. The schema's `allowedActions` is defined but not gated in code &mdash; flagged as a TODO in [Architecture](Reference-Architecture#mode--source-allow-lists). Source: `nodes/valve/src/flow/flowController.js` line 13.
+
+A rejected request logs at warn and short-circuits.
+
+---
+
+## Data model &mdash; `getOutput()` shape
+
+Composed each tick by `src/io/output.js` `buildOutput()`. Delta-compressed: consumers see only the keys that changed.
+
+### Per-measurement keys
+
+For every `(type, variant, position)` stored in MeasurementContainer with a finite value, the flattened output emits:
+
+```
+<position>_<variant>_<type>
+```
+
+This is the **legacy three-segment** key shape (no trailing `<childId>`). Position labels are normalised to lowercase. valve does **not** use the four-segment `<type>.<variant>.<position>.<childId>` shape that `rotatingMachine` emits.
+
+<!-- BEGIN AUTOGEN: data-model — populate via wiki-gen tool (TODO) -->
+
+| Key | Type | Unit | Sample / notes |
+|:---|:---|:---|:---|
+| `state` | string | &mdash; | `"operational"` &mdash; one of the FSM states. |
+| `percentageOpen` | number | % | `60` &mdash; current position `0..100`. |
+| `moveTimeleft` | number | s | `0` &mdash; seconds remaining on the current move. |
+| `mode` | string | &mdash; | `"auto"` / `"virtualControl"` / `"fysicalControl"` / `"maintenance"`. |
+| `delta_predicted_pressure` | number | mbar | Predicted deltaP across the valve. Emitted on the next position tick once kv > 0 and a finite flow is known. |
+| `downstream_predicted_flow` | number | m3/h | Last flow pushed via `data.flow` with `variant=predicted`. |
+| `downstream_measured_flow` | number | m3/h | Last flow pushed via `data.flow` with `variant=measured`, or written by a registered flow measurement child. |
+| `downstream_predicted_pressure` | number | mbar | Last predicted pressure written upstream. |
+| `downstream_measured_pressure` | number | mbar | Last measured pressure from a registered pressure measurement child. |
+
+<!-- END AUTOGEN -->
+
+### Status badge
+
+`buildStatusBadge` in `io/output.js`:
+
+```
+<mode>: <state-symbol>   <position%>%   💨<flow><unit>   ΔP<deltaP> <unit>
+```
+
+(The `position` / `flow` / `deltaP` line only appears in `operational` / `warmingup` / `accelerating` / `decelerating`; other states show just `<mode>: <symbol>`.)
+
+State symbols (per `STATE_SYMBOLS` map in `io/output.js`):
+
+| State | Symbol | Fill |
+|:---|:---:|:---|
+| `off` | ⬛ | red |
+| `idle` | ⏸️ | blue |
+| `operational` | ⏵️ | green |
+| `starting` | ⏯️ | yellow |
+| `warmingup` | 🔄 | green |
+| `accelerating` | ⏩ | yellow |
+| `decelerating` | ⏪ | yellow |
+| `stopping` | ⏹️ | yellow |
+| `coolingdown` | ❄️ | yellow |
+
+When `getFluidCompatibility().status` is `mismatch` or `conflict`, the badge is overridden to a yellow ring with `⚠ <message>` appended.
+
+---
+
+## Configuration schema &mdash; editor form to config keys
+
+Source of truth: `generalFunctions/src/configs/valve.json` plus `nodeClass.buildDomainConfig`.
+
+### General (`config.general`)
+
+| Form field | Config key | Default | Notes |
+|:---|:---|:---|:---|
+| Name | `general.name` | `valve` | Re-derived in `configure()`. |
+| (auto-assigned) | `general.id` | `null` | Node-RED node id. |
+| Default unit | `general.unit` | `m3/h` (schema) | Re-resolved to the unitPolicy `output.flow` in `configure()`. |
+| Enable logging | `general.logging.enabled` | `true` | Master switch. |
+| Log level | `general.logging.logLevel` | `info` | `debug` / `info` / `warn` / `error`. |
+
+### Functionality (`config.functionality`)
+
+| Form field | Config key | Default | Notes |
+|:---|:---|:---|:---|
+| Position vs parent | `functionality.positionVsParent` | `atEquipment` | One of `atEquipment` / `upstream` / `downstream`. Used in the child-register payload that goes UP to VGC. |
+| (hidden) | `functionality.softwareType` | `valve` | Constant. |
+| (hidden) | `functionality.role` | `controller` | Constant. |
+
+### Asset (`config.asset`)
+
+| Form field | Config key | Default | Notes |
+|:---|:---|:---|:---|
+| Asset UUID | `asset.uuid` | `null` | Globally-unique identifier. |
+| Tag code | `asset.tagCode` | `null` | |
+| Geolocation | `asset.geoLocation` | `{x:0, y:0, z:0}` | |
+| Model | `asset.model` | `null` | Optional. If set, resolves curve + supplier / type / allowed units via `assetResolver.resolveAssetMetadata('valve', model)`. If null, the predictor uses the inline `valveCurve`. |
+| Deployment unit | `asset.unit` | `null` | Must appear in the registry's allowed list for the model when set. |
+| Accuracy | `asset.accuracy` | `null` | Optional. |
+| Valve curve | `asset.valveCurve` | `{ '1.204': { '1': { x: [0..100 by 10], y: [0,18,50,95,150,216,337,564,882,1398,1870] } } }` | Nested map: outer key = density (kg per nm³), middle = diameter (mm), leaf = `{x: position%, y: Kv (m³/h)}`. |
+
+Runtime options that bypass `config` and reach `configure()` via `Valve._pendingExtras.runtimeOptions`:
+
+| UI field | runtimeOptions key | Default | Effect |
+|:---|:---|:---|:---|
+| Service type | `serviceType` | derived (`gas` if not `liquid`) | Picks the hydraulic formula in `ValveHydraulicModel`. |
+| Fluid density | `fluidDensity` | model default (997 / 1.204) | Sets `host.rho`. |
+| Fluid temperature K | `fluidTemperatureK` | 293.15 | Sets `host.T`. |
+| Gas choke ratio limit | `gasChokedRatioLimit` | 0.7 | Cap for the gas hydraulic formula. |
+
+> [!WARNING]
+> **Legacy asset fields rejected.** `supplier`, `category`, and `assetType` are no longer node config &mdash; the registry derives them from the model. Flows saved before the AssetResolver refactor will throw a startup error from `_rejectLegacyAssetFields` with a clear migration message. Re-open the node, re-select the model from the asset menu, and save.
+
+### State times (`stateConfig.time`)
+
+Set on the state machine via `nodeClass.buildDomainConfig` from editor fields:
+
+| Form field | Config key | Notes |
+|:---|:---|:---|
+| Startup Time | `time.starting` | Time spent in `starting` before transitioning to `warmingup`. |
+| Warmup Time | `time.warmingup` | Time in `warmingup` &mdash; **non-interruptible** safety. |
+| Shutdown Time | `time.stopping` | Time in `stopping`. |
+| Cooldown Time | `time.coolingdown` | Time in `coolingdown` &mdash; **non-interruptible** safety. |
+
+> [!NOTE]
+> TODO: confirm canonical defaults. `valve.json` does not declare them inline; they come from `generalFunctions/src/configs/state.json` or the parent state-machine schema. Source: `nodeClass.buildDomainConfig` lines 19&ndash;26.
+
+### Movement (`stateConfig.movement`)
+
+| Form field | Config key | Notes |
+|:---|:---|:---|
+| Reaction Speed | `movement.speed` | Position ramp rate (%/s). E.g. `1` means setpoint 60 from 0 takes ~60 s. |
+
+### Sequences (`config.sequences`)
+
+State-transition lists per sequence name. Defaults:
+
+| Sequence | States |
+|:---|:---|
+| `startup` | `[starting, warmingup, operational]` |
+| `shutdown` | `[stopping, coolingdown, idle]` |
+| `emergencystop` | `[emergencystop, off]` |
+| `boot` | `[idle, starting, warmingup, operational]` |
+
+Note: unlike `rotatingMachine`, `valve.json` does not ship `entermaintenance` / `exitmaintenance` sequences. TODO: confirm whether maintenance transitions are intentionally manual.
+
+### Mode (`config.mode`)
+
+| Form field | Config key | Default | Range |
+|:---|:---|:---|:---|
+| Mode | `mode.current` | `auto` | `auto` / `virtualControl` / `fysicalControl` / `maintenance` |
+| (defaults) | `mode.allowedActions.<mode>` | see [Topic contract](#mode--source-allow-lists) | schema only &mdash; not currently gated in code |
+| (defaults) | `mode.allowedSources.<mode>` | see above | enforced by `flowController.isValidSourceForMode` |
+
+### Unit policy
+
+Source: `src/specificClass.js` lines 20&ndash;24.
+
+| Quantity | Canonical (internal) | Output (rendered) | Required-unit |
+|:---|:---|:---|:---:|
+| Pressure | `Pa` | `mbar` | ✓ |
+| Flow | `m3/s` | `m3/h` | ✓ |
+| Temperature | `K` | `C` | ✓ |
+
+`requireUnitForTypes` means MeasurementContainer rejects writes that omit `unit` for these types. The hydraulic model itself reads back via fixed `FORMULA_UNITS = {pressure: 'mbar', flow: 'm3/h', temperature: 'K'}`.
+
+### Calculation mode (`config.calculationMode`)
+
+`low` / `medium` (default) / `high` &mdash; declared in the schema. TODO: confirm whether the dispatch path consults `calculationMode` for trigger frequency. Source: `valve.json` lines 346&ndash;366.
+
+---
+
+## Child registration
+
+Source: `src/specificClass.js` lines 100&ndash;101 and `src/fluid/fluidCompatibility.js`.
+
+valve **overrides** `BaseDomain.registerChild` so registrations fall into `FluidCompatibility.registerChild` rather than the generic ChildRouter. Upstream sources feed the fluid-contract aggregator; measurement children attach via the standard measurement handshake and land in `MeasurementRouter`.
+
+| Software type | Side-effect | Subscribed events |
+|:---|:---|:---|
+| `machine` / `rotatingmachine` | Stored as upstream source; reads `getFluidContract()` or `asset.serviceType`, defaulting to `liquid` for the rotating-equipment family. Recomputes aggregate service type. | `fluidContractChange` |
+| `machinegroup` / `machinegroupcontrol` | Same; recomputes aggregate service type. | `fluidContractChange` |
+| `pumpingstation` | Same. | `fluidContractChange` |
+| `valvegroupcontrol` | Same. | `fluidContractChange` |
+| `measurement` (asset.type=`pressure`, position=`*`) | Routed through `MeasurementRouter.updatePressure(variant, value, position, unit)`; triggers a deltaP recompute. | `<type>.measured.<position>` |
+| `measurement` (asset.type=`flow`, position=`*`) | Routed through `MeasurementRouter.updateFlow(variant, value, position, unit)`; triggers a deltaP recompute. | `<type>.measured.<position>` |
+
+The valve's `_updateMeasurement` path (via `updateMeasurement(variant, subType, value, position, unit)`) currently handles `pressure` and `flow`. `power` is recognised but ignored.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference &mdash; Architecture](Reference-Architecture) | Code map, FSM, hydraulic-model pipeline |
+| [Reference &mdash; Examples](Reference-Examples) | Shipped flows + debug recipes |
+| [Reference &mdash; Limitations](Reference-Limitations) | Known issues and open questions |
+| [EVOLV &mdash; Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions) | Platform-wide topic rules |
+| [EVOLV &mdash; Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry) | Port 0 / 1 / 2 InfluxDB layout |

wiki/Reference-Examples.md

@@ -0,0 +1,143 @@
+# Reference — Examples
+
+![code-ref](https://img.shields.io/badge/code--ref-8c2b2c0-blue)
+
+> [!NOTE]
+> Every example flow shipped under `nodes/valve/examples/`, plus how to load them, what they show, and the debug recipes that go with them. Live source: `nodes/valve/examples/`.
+>
+> Pending full node review (2026-05). The shipped flows are currently minimal stubs; tiered demos (matching the `rotatingMachine` template) are on the backlog.
+
+---
+
+## Shipped examples
+
+| File | Tier | Dependencies | What it shows |
+|:---|:---:|:---|:---|
+| `basic.flow.json` | 1 (stub) | EVOLV only | Minimal: one `inject` → one `valve` → one `debug`. Sanity check that the node loads. |
+| `integration.flow.json` | 2 (stub) | EVOLV only | Same shape as basic; placeholder for VGC + measurement integration. |
+| `edge.flow.json` | 3 (stub) | EVOLV only | Placeholder for edge cases (gas-choke, e-stop, invalid setpoints). |
+
+> [!IMPORTANT]
+> **Tiered example flows TODO.** Replace the three stubs with `01 - Basic Manual Control.json` / `02 - Integration with Valve Group.json` / `03 - Dashboard Visualization.json` following the `rotatingMachine` template. Track in `.agents/improvements/IMPROVEMENTS_BACKLOG.md` and validate live against Docker-stack Node-RED. Screenshots / GIFs land under `wiki/_partial-screenshots/valve/` and `wiki/_partial-gifs/valve/`.
+
+---
+
+## Loading a flow
+
+### Via the editor
+
+1. Open the Node-RED editor at `http://localhost:1880`.
+2. Menu → Import → drag the JSON file.
+3. Click Deploy.
+
+### Via the Admin API
+
+```bash
+curl -X POST -H 'Content-Type: application/json' \
+  --data @"nodes/valve/examples/basic.flow.json" \
+  http://localhost:1880/flow
+```
+
+Use `POST /flow` (single tab, full replace) or `POST /flows` (full deploy) depending on whether other tabs are already loaded.
+
+---
+
+## Driving the basic flow manually
+
+The shipped `basic.flow.json` has a single `inject` wired to the valve. To exercise the FSM + hydraulic model, send the following sequence by hand (e.g. via additional inject nodes you wire in, or the Admin API):
+
+1. `set.mode` — payload `"virtualControl"` — lets the GUI source drive the valve.
+2. `cmd.startup` — payload `{}`. FSM walks `idle → starting → warmingup → operational`. Watch `state` on Port 0.
+3. `set.position` — payload `{"setpoint": 60}`. FSM goes `operational → accelerating → operational`; `percentageOpen` ramps 0 → 60 at `movement.speed` %/s.
+4. `data.flow` — payload `{"variant": "measured", "value": 25, "position": "downstream", "unit": "m3/h"}`. Flow lands in MeasurementContainer; `MeasurementRouter.updateFlow` recomputes deltaP. `delta_predicted_pressure` appears on Port 0; `evt.deltaPChange` fires upward.
+5. `data.flow` — payload `{"variant": "measured", "value": 0, "position": "downstream", "unit": "mbar"}` to push downstream pressure as well (needed for the gas-flow path).
+6. `cmd.shutdown` — payload `{}`. Because the valve is `operational`, the controller first ramps `percentageOpen` to 0, then `state` transitions `stopping → coolingdown → idle`.
+
+> [!IMPORTANT]
+> **GIF needed.** Demo recording of steps 1–6 + status badge progression. Save as `wiki/_partial-gifs/valve/01-basic-demo.gif`, target ≤ 1 MB after `gifsicle -O3 --lossy=80`.
+
+### Try the position-residue handler
+
+After the valve reaches `operational` at 60 %:
+
+1. Send `set.position = {setpoint: 20}`. State goes `operational → decelerating → ...`.
+2. While `decelerating`, send `set.position = {setpoint: 80}`.
+3. `state.moveTo` recognises the residue state, transitions back to `operational` synchronously, then ramps up to 80. No setpoint is lost.
+
+This is the same residue mechanism `rotatingMachine` uses for fast retargets.
+
+### Try the e-stop sequence
+
+From `operational`, send `cmd.estop`. The valve runs the `emergencystop` sequence (`[emergencystop, off]`). Allowed transitions out of `emergencystop` are `idle` / `off` / `maintenance`. To restart, drop to `idle` first (`cmd.shutdown` from `off` may not work depending on the state graph — TODO: confirm).
+
+---
+
+## Integration with `valveGroupControl`
+
+> [!IMPORTANT]
+> **TODO: Tier-2 example.** A proper integration flow with `valveGroupControl` + 2×valve children + an upstream `rotatingMachine` / `pumpingStation` for fluid-contract tracking is on the backlog. Screenshot under `wiki/_partial-screenshots/valve/02-integration.png`.
+
+When built, the integration flow will demonstrate:
+
+- Auto-registration via Port 2 at deploy — each valve's `child.register` reaches the VGC; no manual wiring needed.
+- Upstream-source registration — a `rotatingMachine` registered as a child of the valve feeds `getFluidContract()` into `FluidCompatibility`. Status flips from `pending` / `compatible` / `mismatch` based on `serviceType` agreement.
+- `evt.deltaPChange` propagation from each valve to the VGC for group-level deltaP aggregation.
+
+---
+
+## Dashboard visualization
+
+> [!IMPORTANT]
+> **TODO: Tier-3 example.** A FlowFuse Dashboard 2.0 page (`@flowfuse/node-red-dashboard`) with control buttons (mode, startup, shutdown, e-stop, position slider), live status (state badge, position %, deltaP, flow), and trend charts (deltaP, position) is on the backlog. Save as `03 - Dashboard Visualization.json`.
+
+---
+
+## Docker compose snippet
+
+To bring up Node-RED + InfluxDB with EVOLV nodes pre-loaded:
+
+```yaml
+# docker-compose.yml (extract)
+services:
+  nodered:
+    build: ./docker/nodered
+    ports: ['1880:1880']
+    volumes:
+      - ./docker/nodered/data:/data/evolv
+  influxdb:
+    image: influxdb:2.7
+    ports: ['8086:8086']
+```
+
+Full file: [EVOLV/docker-compose.yml](https://gitea.wbd-rd.nl/RnD/EVOLV/src/branch/development/docker-compose.yml).
+
+---
+
+## Debug recipes
+
+| Symptom | First thing to check | Where to look |
+|:---|:---|:---|
+| Editor throws `legacy asset field(s) [supplier, ...]` on deploy | Flow predates the AssetResolver refactor. Re-open the node, pick the model from the asset menu, save. The registry derives supplier / category / type. | `src/nodeClass.js` `_rejectLegacyAssetFields`. |
+| Status badge shows `⚠ <message>` (yellow ring) | `getFluidCompatibility().status` is `mismatch` or `conflict`. An upstream source advertised a service type that doesn't match this valve's expected type. | `src/fluid/fluidCompatibility.js`, `getFluidCompatibility()`. |
+| `delta_predicted_pressure` stuck at `0` or missing | `kv` is 0 (valve closed), the FSM isn't in `operational` / `accelerating` / `decelerating`, or no flow has landed. For gas flow, also needs a finite `downstream_measured_pressure`. | `state.getCurrentState()`, `percentageOpen`, `MeasurementRouter.updateDeltaP`. |
+| `set.position` has no effect | Source not in `mode.allowedSources[currentMode]`. Watch for `Source '...' is not valid for mode '...'` in the warn log. | `src/flow/flowController.js` `isValidSourceForMode`. |
+| `data.flow` payloads aren't reflected on Port 0 | Payload shape: `{variant: 'measured'\|'predicted', value: <number>, position: <string>, unit?: 'm3/h'}`. Missing `variant` warns `Unrecognized variant '...' for flow update`. Missing `value` warns `Received null or undefined value for flow update`. | `src/measurement/measurementRouter.js` `updateFlow`. |
+| Gas-flow deltaP saturates at a ceiling | The choked-flow cap fired (`isChoked: true` in `hydraulicDiagnostics`). Increase `gasChokedRatioLimit` or revise downstream pressure. | `src/hydraulicModel.js` `_calculateGasDeltaP`. |
+| `query.curve` returns empty `valveCurve` | `asset.model` not found by `assetResolver`; the predictor falls back to inline `asset.valveCurve` &mdash; check that exists. | `src/curve/supplierCurve.js` `SupplierCurvePredictor.snapshot()`. |
+| FSM stuck in `accelerating` / `decelerating` | A move was aborted with `returnToOperationalOnAbort = false`. Send a new `set.position` &mdash; the residue handler in `state.moveTo` transitions back to `operational` first. | `generalFunctions/src/state/state.js` `moveTo` residue branch. |
+| Per-valve Port 0 key names differ from what your dashboard expects | valve uses `<position>_<variant>_<type>` (e.g. `delta_predicted_pressure`, `downstream_measured_flow`). `rotatingMachine` uses `<type>.<variant>.<position>.<childId>`. Don't mix them. | `src/io/output.js` `buildOutput`. |
+
+> Never ship `enableLog: 'debug'` in a demo &mdash; fills the container log within seconds and obscures real errors.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference &mdash; Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference &mdash; Architecture](Reference-Architecture) | Code map, FSM, hydraulic-model pipeline |
+| [Reference &mdash; Limitations](Reference-Limitations) | Known issues and open questions |
+| [valveGroupControl &mdash; Examples](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Reference-Examples) | Group-control demo flows |
+| [EVOLV &mdash; Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns) | Where valve fits in a larger plant |

wiki/Reference-Limitations.md

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+# Reference — Limitations
+
+![code-ref](https://img.shields.io/badge/code--ref-8c2b2c0-blue)
+
+> [!NOTE]
+> What `valve` does not do, current rough edges, and open questions. Open items live in `.agents/improvements/IMPROVEMENTS_BACKLOG.md` in the superproject.
+>
+> Pending full node review (2026-05). Content reflects `CONTRACT.md` and current source only.
+
+---
+
+## When you would not use this node
+
+| Scenario | Use instead |
+|:---|:---|
+| A fixed-restriction orifice (no actuator, no curve) | Model the deltaP externally; valve assumes a position-controlled Kv lookup. |
+| A non-return / check valve (no motorised actuation) | Don't use valve — no FSM-driven position control is exposed for this case. |
+| A pump or compressor (rotating equipment on a Q–H curve) | `rotatingMachine` — it loads a flow / power curve and predicts the operating point. |
+| A throttling device with no known Kv curve | Without `asset.valveCurve` or a registry-resolved model, the predictor stays empty and deltaP recomputes return null. There is no fallback hydraulic model. |
+| A grouped valve manifold | `valveGroupControl` — instantiate this as a child. |
+
+---
+
+## Known limitations
+
+### Gas-choke detection is a hard cap
+
+`hydraulicModel.js` `_calculateGasDeltaP` caps the effective deltaP at `gasChokedRatioLimit * P2_abs` once the raw deltaP exceeds that threshold. The result is a discontinuous step in deltaP — chart traces show a sharp ceiling rather than a smooth choked-flow transition. The `isChoked` flag in `hydraulicDiagnostics` lets consumers detect the regime. Tracked.
+
+### Single-source pressure for the deltaP recompute
+
+`MeasurementRouter` looks for `pressure.measured.downstream` (preferred) or `pressure.predicted.downstream` to feed the gas-flow formula. There is no fallback if both are missing — the hydraulic model returns `null` and `delta_predicted_pressure` simply doesn't get written. The liquid-flow path doesn't need downstream pressure. Tracked.
+
+### Multi-parent registration
+
+Allowed but not exercised in production tests. valve overrides `BaseDomain.registerChild` with `FluidCompatibility.registerChild`, which records upstream sources and aggregates `serviceType`. Teardown ordering (parent gone first vs valve gone first) is not test-covered. Open question.
+
+### `flowController.handleInput` only gates by source, not action
+
+The schema's `mode.allowedActions` is defined but `flowController.handleInput` only enforces `isValidSourceForMode`. A `cmd.shutdown` from a source allowed for the current mode will fire regardless of whether the schema lists `execSequence` in `allowedActions[mode]`. This differs from `rotatingMachine`, which gates both. TODO: confirm whether this is intentional (valve's reduced operational set) or a backlog item.
+
+### `execSequence` legacy umbrella
+
+The `execSequence` topic (with `payload.action = 'startup' | 'shutdown' | 'emergencystop'`) is kept alive for legacy flows. The handler demuxes to the canonical topic; the deprecation warning fires once per session. Scheduled for removal in Phase 7. Use `cmd.startup` / `cmd.shutdown` / `cmd.estop` instead.
+
+### `data.flow` payloads don't clear stale values
+
+If a flow source stops emitting, the last-known value persists in MeasurementContainer. There is no TTL and no explicit clear topic. Workaround: send `value: 0` explicitly. The deltaP recompute then writes 0 (or `null` if it short-circuits on `flow === 0`). Tracked.
+
+### Editor cosmetics don't reflect `asset` derivation
+
+The editor form may still expose supplier / category / type fields even though `_rejectLegacyAssetFields` rejects them on save. Re-saving an old flow surfaces the legacy-fields error until each valve is re-opened and the model re-picked. Cosmetic; the registry is the source of truth.
+
+### No `entermaintenance` / `exitmaintenance` sequences out of the box
+
+`valve.json` ships `startup` / `shutdown` / `emergencystop` / `boot` sequences only. `maintenance` is reachable via `set.mode = maintenance`, but there is no canned state-transition sequence for entering / leaving. `rotatingMachine` defines these in its own config — valve does not. TODO: confirm intentional.
+
+### Position residue handling depends on shared state machine
+
+The residue handler that lets a mid-decel `set.position` re-engage cleanly lives in `generalFunctions/src/state/state.js` `moveTo`. valve inherits the behaviour but the integration test coverage is thin. The sequence-abort token mechanism (`rotatingMachine`, 2026-05-15) may or may not apply to valve's shutdown ramp; TODO: confirm from `FlowController.executeSequence` behaviour when a new `set.position` arrives during the pre-shutdown ramp-to-zero.
+
+---
+
+## Open questions (tracked)
+
+| Question | Where it lives |
+|:---|:---|
+| Gate `mode.allowedActions` in `flowController.handleInput` for parity with `rotatingMachine`? | Internal |
+| Add `entermaintenance` / `exitmaintenance` sequences to `valve.json`? | Internal |
+| Multi-parent teardown ordering | Internal |
+| Add an explicit `data.clear-flow` topic for stale flow cleanup | Internal |
+| Smooth choked-flow transition instead of a hard cap | `hydraulicModel.js` |
+| Does the sequence-abort token mechanism (rotatingMachine, 2026-05-15) apply to valve's pre-shutdown ramp? | Internal — flagged in [Architecture](Reference-Architecture#fsm) |
+| Phase 7 removal of `execSequence` umbrella + legacy aliases | Internal |
+| `calculationMode` (`low` / `medium` / `high`) — does the dispatch path consult it? | `valve.json` schema vs source |
+
+---
+
+## Migration notes
+
+### From pre-AssetResolver
+
+Old flows saved with `supplier`, `category`, or `assetType` fields will throw on deploy:
+
+```
+valve: legacy asset field(s) [supplier, category] are saved on this node.
+After the AssetResolver refactor these are derived from the model id.
+Open the node in the editor, re-select the model, and save to migrate.
+```
+
+The fix is mechanical: open each valve node, re-pick the model from the asset menu, save. No data is lost — the registry has the same supplier / category / type the old flow carried.
+
+### From inline `valveCurve` only
+
+valve still supports `asset.valveCurve` as a fully inline curve fallback when no `asset.model` is set. The predictor logs which `(densityKey, diameterKey)` lane of the dataset it selected. If you migrate from inline-only to a registry-resolved model, the curve may pick a slightly different lane and your operating-point predictions will shift — review on the dashboard before declaring done.
+
+### From `setpoint` topic name (pre-canonical)
+
+The old topic without a `set.` prefix has been retired. Use `set.position` (alias `execMovement`) for position setpoints.
+
+---
+
+## Related pages
+
+| Page | Why |
+|:---|:---|
+| [Home](Home) | Intuitive overview |
+| [Reference — Contracts](Reference-Contracts) | Topic + config + child filters |
+| [Reference — Architecture](Reference-Architecture) | Code map, FSM, hydraulic-model pipeline |
+| [Reference — Examples](Reference-Examples) | Shipped flows + debug recipes |
+| [valveGroupControl — Limitations](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Reference-Limitations) | Where the parent's aggregator sits |

wiki/_Sidebar.md

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+### valve
+
+- [Home](Home)
+
+**Reference**
+
+- [Contracts](Reference-Contracts)
+- [Architecture](Reference-Architecture)
+- [Examples](Reference-Examples)
+- [Limitations](Reference-Limitations)
+
+**Related**
+
+- [EVOLV master wiki](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Home)
+- [valveGroupControl wiki](https://gitea.wbd-rd.nl/RnD/valveGroupControl/wiki/Home)
+- [rotatingMachine wiki](https://gitea.wbd-rd.nl/RnD/rotatingMachine/wiki/Home)
+- [Topology Patterns](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topology-Patterns)
+- [Topic Conventions](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Topic-Conventions)
+- [Telemetry](https://gitea.wbd-rd.nl/RnD/EVOLV/wiki/Telemetry)

wiki/_partial-datamodel.md.template

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+| Key | Type | Unit | Sample |
+|---|---|---|---|
+| `state` | string | — | `"operational"` |
+| `percentageOpen` | number | % | `0` |
+| `moveTimeleft` | number | s | `0` |
+| `mode` | string | — | `"auto"` |
+| `downstream_predicted_flow` | number | m3/h | `0` |
+| `downstream_measured_flow` | number | m3/h | _(emitted when measurement child present)_ |
+| `downstream_predicted_pressure` | number | mbar | _(emitted when upstream pressure present)_ |
+| `downstream_measured_pressure` | number | mbar | _(emitted when measurement child present)_ |
+| `delta_predicted_pressure` | number | mbar | `0` |