Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
valve
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
The definitions consistently define valve by its function to 'control (i.e. permit, obstruct, regulate or divert) a fluid stream'. While valves have various physical mechanisms (ball, gate, butterfly, etc.), these are constructive subtypes of the functional parent. The identity of being a valve is given by the flow control function, not by any particular physical configuration.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
▸
Expert review
— accepted
Axiomatization steps
1
Identity-Giving Function
✓ done
FlowControlFunction → FlowControlProcess ⊑ FlowControl
▼
COPI-Core operation
FlowControl via process parent FlowControl
LLM rationale:
The identity-giving function is the ability to control fluid flow - to permit, obstruct, regulate or divert a fluid stream. This function is what makes a valve a valve regardless of its physical mechanism. Reusing the existing FlowControlFunction from already-enriched classes.
▸
Expert review
— accepted
2
Genus Proximus
✓ done
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
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
While 'FLUID REGULATOR' appears in ISO 15926, this is too domain-specific and not yet enriched. Valve is a foundational equipment category in industrial ontologies. Each valve instance is a single causally unified object with a designed function, making it a MaterialArtifact. The parent candidates show MaterialArtifact as appropriate, and it is already enriched.
▸
Expert review
— accepted
3
Differentia Specifica
✓ done
∃bearerOf.FlowControlFunction
▼
Conditions that distinguish
Valve
from sibling classes under genus
MaterialArtifact.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The flow control function is the minimal differentiating condition. MaterialArtifact already provides the designed function constraint, so we specify the particular type of function that makes something a valve.
▸
Expert review
— accepted
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These three parts are universal to all valve types - the body provides containment, the flow control element performs the actual flow manipulation, and seats provide sealing capability.
▸
Expert review
— accepted
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid
▼
Inputs (I)
Outputs (O)
Transformation (T)
▸
Expert review
More
Alternative labels
none
▼
Synonyms / alternative labels (comma-separated) — skos:altLabel
Language auto-detected on export (PT if the label contains accents, EN otherwise).
Properties as BFO qualities
no CFIHOS/DEXPI properties
▼
No CFIHOS/DEXPI properties found for this cluster.
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on 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
▼
Click "Detect divergences" to analyse cross-standard disagreements for this cluster.
Source Definitions (4)
VALVE — ClassOfFunctionalObject
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
cfihos V2.0
valve — AbstractTagAndEquipmentClass
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Valve
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Valve — Class
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (5)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
standard · verbatim
Linked competency questions
- answered What is a valve?
- answered What are all the subclasses of Valve recognised in COPI?
- answered Which equipment classes in COPI have iof:Assembly as their BFO genus root?
- answered What is the genus of a solenoid valve?
- open What is a seat?
- open Is a seat a necessary component of every valve?
- open What is a valve body?
- open Which COPI equipment classes require a valve body as a necessary component? (candidates: blow down valve, butterfly control valve, double block and bleed valve, safety relief valve, self-operating valve and valve)
OWL/Turtle preview
Download .ttl
Numeric
COPI_* IRIs from copi-iri-map.tsv, with the readable name as a trailing comment. Names not yet in the map stay readable.
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ID 4 · claude-sonnet-4-20250514
Created 2026-04-08 22:26
Updated 2026-09-08 12:26
Last edited by nosantos · 2026-06-23 18:24
