Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
double block and bleed valve
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: structure-based → ⊑
This concept is defined by its specific physical configuration: incorporating TWO seats (double block) plus a means of venting the space between seats (bleed). The functional aspect (flow control) is inherited from the valve genus, while the differentia is purely structural - the dual seating arrangement and intermediate bleed capability.
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:
As a valve subtype, the identity-giving function is FlowControlFunction - the ability to regulate fluid flow. This is the generic function inherited from the valve genus, not a specialized function unique to double block and bleed valves.
▸
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:
The concept is explicitly defined as inheriting from both BLOCK AND BLEED VALVE and DOUBLE BLOCK VALVE in ISO 15926, and manual valve is listed as a parent in CFIHOS. However, the most fundamental genus is Valve, which is already enriched in our ontology with function: FlowControlFunction and genus: MaterialArtifact.
▸
Expert review
— accepted
3
Differentia Specifica
✓ done
∃hasComponentPartAtAllTimes.PrimarySeat ⊓ ∃hasComponentPartAtAllTimes.SecondarySeat ⊓ ∃hasComponentPartAtAllTimes.BleedPort
▼
Conditions that distinguish
Double Block And Bleed Valve
from sibling classes under genus
Valve.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The defining structural characteristic is the dual seating arrangement (primary and secondary seats) combined with the intermediate bleed capability. This differentiates it from single-seat valves, double block valves without bleed, and single block and bleed configurations.
▸
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:
The dual seating system plus bleed port are the essential structural components that define this valve type. The valve body houses this specific arrangement.
▸
Expert review
— accepted
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid + PortionOfFluid
▼
Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Primary signature is standard valve flow control, but with additional bleed output capability that allows venting or sampling from the space between seats for testing seal integrity.
▸
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 Double Block And Bleed Valve as
bfo:Quality subclasses.
Each selected property →
:DoubleBlockAndBleedValveQuality ⊑ bfo:Quality, inheres in :DoubleBlockAndBleedValve
Custom axioms
none
▼
Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Double Block And Bleed 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)
DOUBLE BLOCK AND BLEED VALVE — ClassOfInanimatePhysicalObject
Definition text hidden (copyrighted standard) — sign in to view, or follow the source link above.
cfihos V2.0
double block and bleed valve — TagAndEquipmentClass
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 distinguishes a block-and-bleed valve from a double-block-and-bleed 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 161 · claude-sonnet-4-20250514
Created 2026-04-16 18:11
Updated 2026-09-08 12:26
