exported
equivalent
safety valve
IRI:
http://www.inf.ufrgs.br/ontologies/copi#Safetyvalve
Generated on 2026-04-15
Natural Language Definition
EN
A safety valve is a valve that bears a safety venting function for automatic pressure relief through rapid full opening to protect against dangerous overpressure conditions.
PT-BR
Uma válvula de segurança é uma válvula que possui uma função de ventilação de segurança para alívio automático de pressão por abertura rápida e total para proteção contra condições perigosas de sobrepressão.
Formal Axioms
Semi-formal (Aristotelian)
Every safety valve is a valve that has the function to automatically relieve excess pressure for emergency protection
First-Order Logic Theory
Loading…
▸ Stored override
∀x(SafetyValve(x) ↔ Valve(x) ∧ ∃f(SafetyReliefFunction(f) ∧ bearerOf(x,f)))
OWL 2 / Turtle
@prefix copi: <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix : <https://www.inf.ufrgs.br/ontologies/copi/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix bfo: <http://purl.obolibrary.org/obo/> .
@prefix iof-core: <https://spec.industrialontologies.org/ontology/construct/> .
@prefix iof-av: <https://spec.industrialontologies.org/ontology/annotation/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix qudt: <http://qudt.org/schema/qudt/> .
@prefix dcterms: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix apv: <http://inf.ufrgs.br/ontologies/apv#> .
### COPI — Core Ontology for Petroleum Installations
### Class module: SafetyValve
<https://www.inf.ufrgs.br/ontologies/copi>
rdf:type owl:Ontology ;
dcterms:title "Core Ontology for Petroleum Installations (COPI)"@en ;
dcterms:title "Ontologia Core para Instalações de Petróleo (COPI)"@pt-br ;
dcterms:description "BFO/IOF-Core conformant ontology of equipment classes for petroleum production plants, developed using the five-step RDL enrichment method."@en ;
skos:scopeNote "Material artifacts (bfo:material_entity) that (i) are part of a petroleum production plant, and (ii) bear at least one function whose realization involves the transport (e.g. production and injection), processing (separation and other processes), control, monitoring, measurement, containment or offloading of material or energy."@en ;
skos:scopeNote "Artefatos materiais (bfo:material_entity) que (i) fazem parte de uma planta de produção de petróleo, e (ii) possuem ao menos uma função cuja realização envolve o transporte (p. ex. produção e injeção), processamento (separação e outros processos), controle, monitoramento, medição, contenção ou escoamento de material ou energia."@pt-br ;
skos:scopeNote "COPI provides high-level equipment categories defined by function to demonstrate the defined-class mechanism. Equipment subtypes are annotated with references to CFIHOS and PCA RDL terms. COPI is not a reference data library; organizations should use CFIHOS, PCA RDL, or ISO 14224 for comprehensive equipment classification."@en ;
skos:scopeNote "COPI fornece categorias de alto nível de equipamentos definidas por função para demonstrar o mecanismo de classe definida. Os subtipos de equipamentos são anotados com referências aos termos do CFIHOS e do PCA RDL. COPI não é uma biblioteca de dados de referência; organizações devem utilizar o CFIHOS, o PCA RDL ou a ISO 14224 para classificação abrangente de equipamentos."@pt-br ;
owl:versionInfo "1.1.0" ;
owl:imports <https://spec.industrialontologies.org/ontology/core/Core/> ;
owl:imports <http://purl.obolibrary.org/obo/bfo/2020/bfo.owl> ;
dcterms:creator "Nicolau Oyhenard dos Santos"@en ;
dcterms:contributor "Cauã Antunes" ;
dcterms:contributor "Haroldo Rojas" ;
dcterms:contributor "Rafael Petry" ;
dcterms:contributor "Régis Romeu" ;
dcterms:contributor "Mara Abel" ;
dcterms:isPartOf <https://inf.ufrgs.br/projetos/OntoKG> ;
dcterms:publisher "Universidade Federal do Rio Grande do Sul (UFRGS)"@en ;
dcterms:license <https://creativecommons.org/licenses/by/4.0/> ;
dcterms:created "2026-04-08"^^xsd:date ;
dcterms:modified "2026-10-07"^^xsd:date ;
apv:GlobalMinLanguageCoverage "en pt-br" ;
apv:ClassURIFormationRule "https://www[.]inf[.]ufrgs[.]br/ontologies/copi/(COPI_[0-9]{7}|[A-Z][A-Za-z0-9]*)" ;
apv:ClassMinAnnotationCoverage "rdfs:label https://spec.industrialontologies.org/ontology/annotation/naturalLanguageDefinition" .
iof-av:naturalLanguageDefinition rdf:type owl:AnnotationProperty ;
apv:MinAnnotationLength 20 .
### Identity-giving function
:COPI_0000168 rdf:type owl:Class ; # SafetyVentingFunction
rdfs:subClassOf iof-core:DesignedFunction ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:allValuesFrom :COPI_0000034 # SafetyReliefProcess
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty bfo:BFO_0000054 ; # realizedIn
owl:someValuesFrom :COPI_0000034 # SafetyReliefProcess
] ;
rdfs:label "safety venting function"@en ;
rdfs:label "função de ventilação de segurança"@pt-br .
### Process type
:COPI_0000034 rdf:type owl:Class ; # SafetyReliefProcess
rdfs:subClassOf iof-core:PlannedProcess ;
rdfs:label "safety relief process"@en ;
rdfs:label "processo de alívio de segurança"@pt-br .
:COPI_0000034 # SafetyReliefProcess
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasInput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] ;
rdfs:subClassOf [
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasSpecifiedOutput ;
owl:someValuesFrom :COPI_0000037 # PortionOfFluid
] .
### Equipment universal: SafetyValve
:COPI_0000148 rdf:type owl:Class ; # SafetyValve
owl:equivalentClass [
rdf:type owl:Class ;
owl:intersectionOf (
:COPI_0000077 # Valve
[
rdf:type owl:Restriction ;
owl:onProperty iof-core:hasFunction ; # Object branch (MaterialArtifact/Assembly/Object/FiatObjectPart)
owl:someValuesFrom :COPI_0000168 # SafetyVentingFunction
]
)
] ;
rdfs:label "safety valve"@en ;
rdfs:label "válvula de segurança"@pt-br ;
iof-av:naturalLanguageDefinition "A safety valve is a valve that bears a safety venting function for automatic pressure relief through rapid full opening to protect against dangerous overpressure conditions."@en ;
skos:definition "A safety valve is a valve that bears a safety venting function for automatic pressure relief through rapid full opening to protect against dangerous overpressure conditions."@en ;
iof-av:naturalLanguageDefinition "Uma válvula de segurança é uma válvula que possui uma função de ventilação de segurança para alívio automático de pressão por abertura rápida e total para proteção contra condições perigosas de sobrepressão."@pt-br ;
iof-av:semiFormalNaturalLanguageAxiom "Every safety valve is a valve that has the function to automatically relieve excess pressure for emergency protection"@en ;
iof-av:firstOrderLogicAxiom "∀x(SafetyValve(x) ↔ Valve(x) ∧ ∃f(SafetyReliefFunction(f) ∧ bearerOf(x,f)))"@en ;
skos:definition "[ISO 15926-4] A <SAFETY VALVE> is an <INSTRUMENTATION ITEM> and a <PRESSURE RELIEF DEVICE> that is used in gas service"@en ;
skos:definition "[SLB Glossary] A quick-opening, pop-action valve used for fast relief of excessive pressure."@en ;
skos:definition "[OnePetro] Various. Generally used in describing a surface or subsurface safety valve."@en .
# Disjointness: SafetyValve and CheckValve
[] rdf:type owl:AllDisjointClasses ;
owl:members ( :COPI_0000148 :COPI_0000103 ) . # SafetyValve, CheckValve
Axiomatization Decision Log
1
Identity-Giving Function
Function class
SafetyVentingFunction
⊑ DesignedFunction
Realized in
SafetyReliefProcess
⊑ PlannedProcess
The identity-giving function is safety relief - automatically releasing excess pressure to protect equipment and personnel from dangerous overpressure conditions. This function is already identified in the enriched classes list as the defining function for safety relief valve, confirming this is the established function for safety-oriented pressure relief.
✓
Expert review — Accepted
2
Genus Determination
Valve
Safety valve is clearly a subtype of Valve, which is already enriched in the ontology with function FlowControlFunction and genus MaterialArtifact. The parent candidates include 'PRESSURE RELIEF DEVICE' but this is a functional category that cuts across multiple valve types. Valve is the most specific structural superclass that provides the valve body, closure mechanism, and basic flow control infrastructure that safety valves inherit.
✓
Expert review — Accepted
3
Necessary Parts
No necessary parts recorded (concept may be primitive at this level).
Safety valves inherit basic valve parts (body, closure mechanism) from the Valve genus. The distinguishing parts are those that enable automatic pressure-responsive operation for safety protection.
✓
Expert review — Accepted
"SpringMechanism → is_subtype_specific=true (pilot-operated SVs have no direct spring)"
4
Process Participation Signature ⟨I, O, T⟩
Inputs (I)
PortionOfFluid
— above safety relief pressure threshold
Outputs (O)
PortionOfFluid
— relieved to safe pressure level
Transformation (T)
pressure reduction through rapid discharge to atmosphere or relief system
Safety valves take high-pressure fluid input and rapidly discharge it to reduce system pressure below dangerous levels. The transformation is specifically pressure reduction for emergency protection, distinguishing it from gradual pressure control or process regulation.
✓
Expert review — Accepted
5
Axiom Mode Decision
Necessary + Sufficient
— modelled as a defined class
(≡, EquivalentClass). Automatic classification is
appropriate for this concept.
✓
Expert review — Accepted
Disjointness Axioms
CheckValve
C2: check valve. Check valves prevent backflow (unidirectional flow control) while safety valves provide pressure relief (emergency pressure protection). These have incompatible process signatures - one prevents reverse flow, the other enables emergency discharge regardless of flow direction.
Cross-Standard Observations
The ISO 15926 definition emphasizes instrumentation and gas service aspects, while SLB focuses on the quick-opening pop-action mechanism. OnePetro provides minimal definition but the subtypes show extensive specialization for downhole applications. All sources agree on the core safety/pressure relief function.
Source Definitions
3 sources
ISO 15926-4
SAFETY VALVE ↗
Definition text withheld (copyrighted standard) — follow the source link above.
SLB Glossary
safety valve ↗
Definition text withheld (copyrighted standard) — follow the source link above.
onepetro_glossary
Safety valve ↗
Definition text withheld (copyrighted standard) — follow the source link above.
Metadata
| Ontology | COPI |
| Research group | INF-UFRGS-Ontologies |
| Funding | CNPq INF-UFRGS-ENERGIA |
| Project | OntoKG / Petrobras |
| ID | #106 |
| Cluster | safety valve |
| Status | exported |
| Axiom mode | equivalent |
| Created | 2026-04-15 |
| Updated | 2026-09-08 |
ISA 5.1-2022 P&ID Symbol
wikimedia/valve.svg
