valve/wiki/Reference-Contracts.md

Reference — Contracts

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.

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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.

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.

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 — callers must migrate to the canonical topics.

Mode / source allow-lists

A topic that survives the registry still passes through flowController.handleInput:

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 — flagged as a TODO in Architecture. Source: nodes/valve/src/flow/flowController.js line 13.

A rejected request logs at warn and short-circuits.

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Data model — 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.

Key	Type	Unit	Sample / notes
state	string	—	"operational" — one of the FSM states.
percentageOpen	number	%	60 — current position 0..100.
moveTimeleft	number	s	0 — seconds remaining on the current move.
mode	string	—	"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.

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.

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Configuration schema — 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 — 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 — non-interruptible safety.
Shutdown Time	time.stopping	Time in stopping.
Cooldown Time	time.coolingdown	Time in coolingdown — 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 19–26.

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	schema only — not currently gated in code
(defaults)	mode.allowedSources.<mode>	see above	enforced by flowController.isValidSourceForMode

Unit policy

Source: src/specificClass.js lines 20–24.

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 — declared in the schema. TODO: confirm whether the dispatch path consults calculationMode for trigger frequency. Source: valve.json lines 346–366.

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Child registration

Source: src/specificClass.js lines 100–101 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.

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Related pages

Page	Why
Home	Intuitive overview
Reference — Architecture	Code map, FSM, hydraulic-model pipeline
Reference — Examples	Shipped flows + debug recipes
Reference — Limitations	Known issues and open questions
EVOLV — Topic Conventions	Platform-wide topic rules
EVOLV — Telemetry	Port 0 / 1 / 2 InfluxDB layout