Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
blow down valve
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
The identity is given by the specific function of rapid depressurization of high pressure systems. While all valves control flow, blow down valves have a specialized function of emergency or rapid pressure release, which distinguishes them from general flow control valves.
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
RapidDepressurizationFunction → RapidDepressurizationProcess ⊑ FlowControl
▼
COPI-Core operation
FlowControl via process parent FlowControl
LLM rationale:
The identity-giving function is the capability for rapid depressurization of high pressure systems. This is a specialized safety/operational function distinct from general flow control, as it specifically addresses emergency pressure release scenarios.
▸
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
bfo:ObjectAggregate branch
bfo:ImmaterialEntity branch
LLM rationale:
Both standards explicitly state this is a valve. 'Valve' is the most specific appropriate superclass and is already enriched in our ontology with FlowControlFunction. The parent_candidates include VALVE from iso15926, confirming this classification.
▸
Expert review
— accepted
3
Differentia Specifica
✓ done
∃bearerOf.RapidDepressurizationFunction
▼
Conditions that distinguish
Blow Down 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 is the specialized function for rapid depressurization, which is distinct from general flow control. This function is specifically mentioned in both source definitions and represents the unique purpose that distinguishes blow down valves from other valve types.
▸
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:
Blow down valves inherit the essential valve parts from their genus. No additional parts are universally necessary at this level as implementation can vary (manual operation, actuated, etc.)
▸
Expert review
— accepted
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid + PortionOfFluid
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Takes high pressure fluid and rapidly reduces pressure by discharging fluid to atmosphere or lower pressure system. The key characteristic is the rapid nature of the depressurization.
▸
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
0 of 18 selected
▼
Select which CFIHOS/DEXPI properties inhere in every instance of Blow Down Valve as
bfo:Quality subclasses.
Each selected property →
:BlowDownValveQuality ⊑ bfo:Quality, inheres in :BlowDownValve
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Blow Down 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 (2)
BLOW DOWN VALVE — ClassOfInanimatePhysicalObject
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
cfihos V2.0
blow down valve — TagClass
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
Provenance tiers (2)
Sources the pipeline cited while building this entry. Verbatim = the quote was copied word-for-word from that source; summary = paraphrased.
Linked competency questions
- answered What are all the subclasses of Valve recognised in COPI?
- answered Which equipment classes in COPI are defined with equivalent (sufficient + necessary) conditions?
- answered Which equipment classes bear a SafetyFunction as identity-giving function?
- answered What is the identity-giving function of a blow down 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 156 · claude-sonnet-4-20250514
Created 2026-04-16 11:49
Updated 2026-09-08 12:26
