diff --git a/package.json b/package.json
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+++ b/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",
diff --git a/wiki/Home.md b/wiki/Home.md
new file mode 100644
index 0000000..5212d5a
--- /dev/null
+++ b/wiki/Home.md
@@ -0,0 +1,259 @@
+# valve
+
+> **Reflects code as of `e27135b` · regenerated `2026-05-11` via `npm run wiki:all`**
+> If this banner is stale, the page may be out of date. Treat as informative, not authoritative.
+
+## 1. What this node is
+
+**valve** models a single throttling valve. It loads a supplier characteristic curve (Kv-vs-position), drives an FSM-style move sequence for opening/closing, and recomputes pressure drop across the valve from current flow + Kv. Used standalone or as a child of `valveGroupControl` when grouped.
+
+## 2. Position in the platform
+
+```mermaid
+flowchart LR
+    vgc[valveGroupControl<br/>Unit]:::unit -->|set.position| this[valve<br/>Equipment]:::equip
+    src[machine / MGC / PS<br/>upstream source]:::unit -->|child.register| this
+    meas[measurement<br/>type=pressure / flow]:::ctrl -.data.-> this
+    this -->|child.register| vgc
+    this -->|evt.deltaPChange| vgc
+    classDef unit fill:#50a8d9,color:#000
+    classDef equip fill:#86bbdd,color:#000
+    classDef ctrl fill:#a9daee,color:#000
+```
+
+S88 colours: Unit `#50a8d9`, Equipment `#86bbdd`, Control Module `#a9daee`. Source of truth: `.claude/rules/node-red-flow-layout.md`.
+
+## 3. Capability matrix
+
+| Capability | Status | Notes |
+|---|---|---|
+| Predicts deltaP from flow + Kv | ✅ | Hydraulic model picks liquid vs gas formula per `serviceType`. |
+| Loads supplier curve by model name | ✅ | `asset.model` resolved through `loadModel`; inline curve override supported. |
+| Position move FSM | ✅ | `opening` / `closing` states with interruptible setpoints. |
+| Startup / shutdown sequences | ✅ | Pre-shutdown ramps to position 0 when operational. |
+| Emergency-stop sequence | ✅ | Aliased `cmd.estop` → state-machine `emergencystop`. |
+| Fluid-contract aggregation | ✅ | Tracks upstream service type via registered sources. |
+| Gas-choke detection | ⚠️ | Capped at `gasChokedRatioLimit`; surfaced in `hydraulicDiagnostics`. |
+| Multi-parent registration | ⚠️ | Allowed but not exercised in production tests. |
+
+## 4. Code map
+
+```mermaid
+flowchart TB
+    subgraph nodeRED["nodeClass.js — adapter (BaseNodeAdapter)"]
+        nc["buildDomainConfig()<br/>static DomainClass, commands"]
+    end
+    subgraph domain["specificClass.js — orchestrator (BaseDomain)"]
+        sc["Valve.configure()<br/>wires concern modules<br/>installs FluidCompatibility registerChild"]
+    end
+    subgraph concerns["src/ concern modules"]
+        state["state/<br/>stateBindings → positionChange"]
+        fluid["fluid/<br/>FluidCompatibility"]
+        curve["curve/<br/>SupplierCurvePredictor"]
+        meas["measurement/<br/>MeasurementRouter + FORMULA_UNITS"]
+        flow["flow/<br/>FlowController (setpoint, sequences)"]
+        io["io/<br/>buildOutput + buildStatusBadge"]
+        hyd["hydraulicModel.js<br/>ValveHydraulicModel"]
+    end
+    nc --> sc
+    sc --> state
+    sc --> fluid
+    sc --> curve
+    sc --> meas
+    sc --> flow
+    sc --> io
+    sc --> hyd
+```
+
+| Module | Owns | Read first if you're changing… |
+|---|---|---|
+| `state/` | Bindings from state-machine `positionChange` → `updatePosition()` | Move-finished triggers. |
+| `fluid/` | Service-type compatibility, contract aggregation | Gas-vs-liquid mismatch warnings. |
+| `curve/` | Supplier Kv curve load + interpolation | Curve fitting, model selection. |
+| `measurement/` | Pressure/flow routing + deltaP recompute | What triggers a recalc. |
+| `flow/` | Sequence + setpoint execution | Startup / shutdown / move semantics. |
+| `io/` | Port-0 output shape + status badge | What lands on the wire each tick. |
+
+## 5. Topic contract
+
+> **Auto-generated** from `src/commands/index.js`. Do NOT hand-edit between the markers. Re-run `npm run wiki:contract`.
+
+<!-- BEGIN AUTOGEN: topic-contract -->
+
+| Canonical topic | Aliases | Payload | Effect |
+|---|---|---|---|
+| `set.mode` | `setMode` | `string` | Replaces the named state value with the supplied payload. |
+| `cmd.startup` | _(none)_ | `any` | Triggers an action / sequence — not idempotent. |
+| `cmd.shutdown` | _(none)_ | `any` | Triggers an action / sequence — not idempotent. |
+| `cmd.estop` | `emergencystop`, `emergencyStop` | `any` | Triggers an action / sequence — not idempotent. |
+| `execSequence` | _(none)_ | `object` | _(see handler)_ |
+| `set.position` | `execMovement` | `object` | Replaces the named state value with the supplied payload. |
+| `data.flow` | `updateFlow` | `object` | Pushes a value into the node's measurement stream. |
+| `query.curve` | `showcurve` | `any` | Read-only query; node replies on the same msg. |
+| `child.register` | `registerChild` | `string` | Parent/child plumbing — registers or unregisters a child node. |
+
+<!-- END AUTOGEN: topic-contract -->
+
+## 6. Child registration
+
+valve overrides BaseDomain's default `registerChild` with `FluidCompatibility.registerChild` so upstream-source contracts feed the fluid aggregator. Measurement children attach through the generic measurement handshake.
+
+```mermaid
+flowchart LR
+    subgraph kids["accepted children (softwareType)"]
+        src["machine / rotatingmachine /<br/>machinegroup / pumpingstation /<br/>valvegroupcontrol"]:::unit
+        m["measurement"]:::ctrl
+    end
+    src -->|getFluidContract| fluid[FluidCompatibility<br/>aggregates serviceType]
+    m   -->|"&lt;type&gt;.measured.&lt;position&gt;"| router[MeasurementRouter<br/>updatePressure / updateFlow]
+    router --> deltaP[updateDeltaP<br/>writes pressure.predicted.delta]
+    fluid --> evt1[evt.fluidCompatibilityChange]
+    deltaP --> evt2[evt.deltaPChange]
+    classDef unit fill:#50a8d9,color:#000
+    classDef ctrl fill:#a9daee,color:#000
+```
+
+| softwareType | onRegister side-effect | Subscribed events |
+|---|---|---|
+| `machine` / `rotatingmachine` | Stored as upstream source; reads `getFluidContract()` or default `liquid`. | `fluidContractChange`. |
+| `machinegroup` / `machinegroupcontrol` | Same; recomputes aggregate service type. | `fluidContractChange`. |
+| `pumpingstation` | Same. | `fluidContractChange`. |
+| `valvegroupcontrol` | Same. | `fluidContractChange`. |
+| `measurement` | Routed via measurement handshake; values land in MeasurementContainer. | `<type>.measured.<position>`. |
+
+## 7. Lifecycle — what one event does
+
+```mermaid
+sequenceDiagram
+    participant parent as valveGroupControl
+    participant valve as valve
+    participant state as state FSM
+    participant hyd as hydraulicModel
+    participant out as Port-0
+
+    parent->>valve: set.position { setpoint: 60 }
+    valve->>state: moveTo(60)
+    state-->>valve: positionChange ticks
+    valve->>valve: predictKv(position)
+    valve->>hyd: calculateDeltaPMbar(q, kv, downP, rho, T)
+    hyd-->>valve: { deltaPMbar, details }
+    valve->>valve: write pressure.predicted.delta
+    valve->>parent: emitter.emit('deltaPChange', deltaP)
+    valve->>out: msg{topic, payload (delta-compressed)}
+```
+
+## 8. Data model — `getOutput()`
+
+What lands on Port 0. Composed in `io/output.buildOutput`, then delta-compressed by `outputUtils.formatMsg`.
+
+<!-- BEGIN AUTOGEN: data-model -->
+
+| 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` |
+
+<!-- END AUTOGEN: data-model -->
+
+Measurement-derived keys follow the legacy `<position>_<variant>_<type>` shape (e.g. `downstream_predicted_flow`, `delta_predicted_pressure`) and are emitted only when the container holds a finite value.
+
+## 9. Configuration — editor form ↔ config keys
+
+```mermaid
+flowchart TB
+    subgraph editor["Node-RED editor form"]
+        f1[Mode]
+        f2[Asset model]
+        f3[Service type]
+        f4[Diameter]
+        f5[Fluid density / temperature]
+        f6[Inline valveCurve override]
+    end
+    subgraph config["Domain config slice"]
+        c1[mode.current]
+        c2[asset.model]
+        c3[asset.serviceType]
+        c4[asset.valveDiameter]
+        c5[asset.fluidDensity / fluidTemperatureK]
+        c6[asset.valveCurve]
+    end
+    f1 --> c1
+    f2 --> c2
+    f3 --> c3
+    f4 --> c4
+    f5 --> c5
+    f6 --> c6
+```
+
+| Form field | Config key | Default | Range | Where used |
+|---|---|---|---|---|
+| Mode | `mode.current` | per schema | enum | `setMode`, `flowController` |
+| Asset model | `asset.model` | `null` | string | `SupplierCurvePredictor` |
+| Service type | `asset.serviceType` | per asset | `gas` / `liquid` | `ValveHydraulicModel` |
+| Diameter | `asset.valveDiameter` | per asset | > 0 (m) | curve key selection |
+| Fluid density | `asset.fluidDensity` | model default | > 0 (kg/m³) | hydraulic formula |
+| Fluid temperature | `asset.fluidTemperatureK` | model default | > 0 (K) | hydraulic formula |
+| Choked-flow cap | `asset.gasChokedRatioLimit` | per asset | 0–1 | gas formula clamp |
+
+## 10. State chart
+
+```mermaid
+stateDiagram-v2
+    [*] --> off
+    off --> idle: cmd.startup
+    idle --> opening: set.position > 0
+    opening --> operational: position reached
+    operational --> opening: set.position changed
+    operational --> closing: set.position < current
+    closing --> closed: position == 0
+    closed --> opening: set.position > 0
+    operational --> stopping: cmd.shutdown (ramps to 0)
+    stopping --> idle: cooldown elapsed
+    operational --> emergencystop: cmd.estop
+    emergencystop --> off: cmd.reset
+```
+
+The `opening` / `closing` states cover the move-in-progress window; `positionChange` ticks fire until the setpoint is reached, then the FSM lands on `operational`. Pre-shutdown ramp to 0 is enforced by `FlowController.executeSequence('shutdown')`.
+
+## 11. Examples
+
+| Tier | File | What it shows | Mandatory? |
+|---|---|---|---|
+| Basic | `examples/01-Basic.flow.json` | Inject `set.position` + dashboard, no parent | ✅ |
+| Integration | `examples/02-Integration.flow.json` | valve + VGC + upstream source | ✅ |
+| Dashboard | `examples/03-Dashboard.flow.json` | Live FlowFuse charts (position, ΔP, flow) | ⭕ |
+
+Screenshots under `wiki/_partial-screenshots/valve/` when produced. Docker compose snippet under `examples/README.md`.
+
+## 12. Debug recipes
+
+| Symptom | First thing to check | Where to look |
+|---|---|---|
+| Status badge shows `⚠ no input` | Did any pressure / flow measurement register? Watch Port 2. | Editor debug tap on Port 2 |
+| `delta_predicted_pressure` stuck at zero | Is `kv > 0`? FSM may be in `off` / `closed`. | `state.getCurrentState()` |
+| Gas mismatch warning on status badge | `fluidCompatibility.status` is `mismatch` / `conflict`. | `getFluidCompatibility()` |
+| `query.curve` returns empty curve | Asset model not found by `loadModel`; fallback to `config.asset.valveCurve`. | `SupplierCurvePredictor.snapshot()` |
+| deltaP non-finite | Downstream gauge pressure absolute term ≤ 0, or choked ratio reached. | `hydraulicDiagnostics` |
+
+> Never ship `enableLog: 'debug'` in a demo — fills the container log within seconds and obscures real errors. Use only for live debugging.
+
+## 13. When you would NOT use this node
+
+- Use valve for a **throttling element** with a known Kv curve. For a fixed-restriction orifice with no actuator, model the deltaP externally.
+- Don't use valve to model a non-return / check valve — no position control or curve fitting is exposed.
+- Skip valve when an upstream source provides flow directly and no pressure-drop estimate is needed; just wire the source straight to the parent.
+
+## 14. Known limitations / current issues
+
+| # | Issue | Tracked in |
+|---|---|---|
+| 1 | Gas-choke detection is a hard cap, not a smooth transition — chart traces show a step at the choked-ratio limit. | `hydraulicModel.js` |
+| 2 | Multi-parent registration is allowed but not exercised in production tests. | CONTRACT.md `## Children registered by this node` |
+| 3 | `set.position` move sequences are interruptible but tests cover happy-path only. | P10 test-suite refactor |
diff --git a/wiki/_partial-datamodel.md.template b/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` |