Needle Valve

Definition & axiom

Label (EN)

needle valve

Label (PT-BR)

Definition (EN)

Definition (PT-BR)

Semi-formal axiom (Aristotelian)

Axiom type

Necessary only (⊑) Necessary + sufficient (≡)

LLM classification basis: structure-based → ⊑

The identity of a needle valve is fundamentally defined by its physical mechanism: a conical needle-shaped plug that seats into a small orifice. All sources emphasize the distinctive needle geometry rather than a unique function - it performs the same flow control as other valves but with a specific structural mechanism that enables precise flow metering and high-pressure operation.

Validation status

Why primitive (necessary only)

Reviewer notes

FOL theory & disjointness

First-order logic theory (generated)

                                  Loading…
                                

Disjoint with

▸ Expert review — accepted

Axiomatization steps

1 Identity-Giving Function ✓ done FlowControlFunction → FlowControlProcess ⊑ FlowControl ▼

Function Class

Parent ↗ IOF-Core

Process Class

Process Parent ↗ IOF-Core

COPI-Core operation FlowControl via process parent FlowControl

LLM rationale: A needle valve performs the same basic flow control function as other valves. While it excels at flow metering and precise control due to its needle geometry, this is a capability arising from its construction, not a distinct function type. The function is inherited from the valve genus.

▸ Expert review — accepted

2 Genus Proximus ✓ done Valve · MaterialArtifact ▼

Genus (genus proximum)

Most specific superclass — may be a domain class like "Valve" or an IOF-Core root.

BFO/IOF-Core Root

bfo:Object branch

Assembly ↗

Disassemblable unit (pump, compressor, HX)

MaterialArtifact ↗

Monolithic artefact (valve, pipe, sensor)

Object ↗

bfo:Object — when neither Assembly nor MaterialArtifact fits

FiatObjectPart ↗

Fiat part (well interval, pipe segment)

bfo:ObjectAggregate branch

EngineeredSystem ↗

Deliberate system of interacting objects (train, package)

ObjectAggregate ↗

bfo:ObjectAggregate — when EngineeredSystem is too specific

bfo:ImmaterialEntity branch

Site ↗

bfo:Site — cavity / spatial region (wellbore, annulus). No DesignedFunction axiom.

LLM rationale: Multiple sources explicitly state that a needle valve is a type of valve (ISO 15926, CFIHOS, POSC Caesar). While ISO 15926 and others mention it's a subtype of 'globe valve', the Valve class is already enriched in our ontology and represents the most appropriate genus level. Globe valve would be an intermediate classification that we can address separately.

▸ Expert review — accepted

3 Differentia Specifica ✓ done ∃hasComponentPartAtAllTimes.NeedlePlug ⊓ ∃hasComponentPartAtAllTimes.SmallOrificeSeat ▼

Conditions that distinguish Needle Valve from sibling classes under genus Valve. Only what is not already entailed by the genus.

Differentia expression

Differentia (natural language)

LLM rationale: The differentia captures the two essential structural features consistently mentioned across sources: the needle-shaped (conical) plug and the small seat/orifice. This combination enables the characteristic precise flow control and high-pressure capabilities mentioned in the definitions.

▸ Expert review — accepted

4 Necessary Parts ✓ done Plug ▼

Consider part-whole relations beyond subsumption: hasComponentPartAtAllTimes (universal, structurally essential) · hasComponentPartAtSomeTime (contingent, optional component)

LLM rationale: These parts constitute the essential structural differentia of needle valves. The needle plug and small orifice seat work together to provide the precise flow control characteristic of this valve type.

▸ Expert review — accepted

5 Process Participation Signature ⟨I, O, T⟩ ✓ done PortionOfFluid → PortionOfFluid ▼

Inputs (I)

Outputs (O)

Transformation (T)

LLM rationale: Needle valves provide precise flow control by varying the effective orifice area as the needle is positioned. They are particularly suited for low flow rates and high-pressure applications due to the small orifice design.

▸ Expert review

Alternative labels none ▼

Synonyms / alternative labels (comma-separated) — skos:altLabel

Language auto-detected on export (PT if the label contains accents, EN otherwise).

Custom axioms none ▼

Axioms not produced by the pipeline. Each is appended verbatim as an rdfs:subClassOf restriction on Needle Valve.

Write the restriction block in Turtle syntax (without the leading rdfs:subClassOf). Example: [ owl:onProperty :hasPart ; owl:someValuesFrom :Wellhead ]

Cross-standard divergences none detected yet ▼

Full matrix

Click "Detect divergences" to analyse cross-standard disagreements for this cluster.

Source Definitions (5)