Definition & axiom
⚠ Conflicts with the ISO 15926-4 primary definition
Label (EN)
restriction orifice
Label (PT-BR)
Definition (EN)
Definition (PT-BR)
Semi-formal axiom (Aristotelian)
Axiom type
LLM classification basis: function-based → ≡
A restriction orifice is defined by its function to restrict flow by creating pressure drop, regardless of the physical implementation (single hole, multi-hole, plate geometry, etc.). The ISO definition emphasizes 'intended for use as a restrictor', which is a functional specification.
Validation status
Why primitive (necessary only)
Reviewer notes
FOL theory & disjointness
First-order logic theory (generated)
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Disjoint with
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Expert review
Axiomatization steps
1
Identity-Giving Function
✓ done
FlowRestrictionFunction → FlowRestrictionProcess ⊑ FlowControl
▼
COPI-Core operation
FlowControl via process parent FlowControl
LLM rationale:
The identity-giving function is to restrict fluid flow by creating a controlled pressure drop. This is distinct from flow control (which modulates flow) and is specifically about creating resistance to flow through geometric constriction.
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Expert review
2
Genus Proximus
✓ done
FlowModificationAccessory · MaterialArtifact
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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 ISO definition explicitly states that a restriction orifice is a FLOW MODIFICATION ACCESSORY. This is the most specific superclass provided. Since this genus is not in the enriched classes list, it would be a MaterialArtifact (causally unified flow-modifying component without removable subparts).
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Expert review
3
Differentia Specifica
✓ done
∃bearerOf.FlowRestrictionFunction
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Conditions that distinguish
Restriction Orifice
from sibling classes under genus
FlowModificationAccessory.
Only what is not already entailed by the genus.
Differentia expression
Differentia (natural language)
LLM rationale:
The differentia is the specific flow restriction function, which is a subtype of the general flow modification function provided by the genus. This distinguishes it from other accessories that modify flow in different ways.
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Expert review
4
Necessary Parts
✓ done
no necessary parts
▼
Consider part-whole relations beyond subsumption:
hasComponentPartAtAllTimes (universal, structurally essential)
· hasComponentPartAtSomeTime (contingent, optional component)
LLM rationale:
These are the minimal essential parts - a plate structure and the aperture(s) that create the restriction. Mounting hardware and flanges vary by application.
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Expert review
5
Process Participation Signature ⟨I, O, T⟩
✓ done
PortionOfFluid → PortionOfFluid
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Inputs (I)
Outputs (O)
Transformation (T)
LLM rationale:
Single input stream experiences pressure drop through the restriction, creating a lower pressure output stream. The transformation is irreversible energy dissipation.
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Expert review
More
Alternative labels
none
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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
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Axioms not produced by the pipeline. Each is appended verbatim as an
rdfs:subClassOf restriction on Restriction Orifice.
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 (1)
RESTRICTION ORIFICE — ClassOfInanimatePhysicalObject
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Provenance tiers (1)
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 Which equipment classes in COPI have iof:MaterialArtifact as their BFO genus root?
- answered What is the difference between an orifice plate and a restriction orifice?
- answered What is the identity-giving function of a restriction orifice?
- open What is a flow modification accessory?
- open Is flow modification accessory the correct genus for restriction orifice in the COPI ontology?
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 86 · claude-sonnet-4-20250514
Created 2026-04-13 23:43
Updated 2026-09-08 12:26
