Class Ifc4::IfcValve¶

Defined in File Ifc4.h

Nested Relationships¶

This class is a nested type of Struct Ifc4.

Inheritance Relationships¶

Base Type¶

public Ifc4::IfcFlowController (Class Ifc4::IfcFlowController)

Class Documentation¶

class Ifc4::IfcValve : public Ifc4::IfcFlowController ¶

A valve is used in a building services piping distribution system to control or modulate the flow of the fluid.

HISTORY New entity in IFC2x4

Type Use Definition IfcValve defines the occurrence of any valve; common information about valve types is handled by IfcValveType. The IfcValveType (if present) may establish the common type name, usage (predefined type), properties, materials, ports, composition, assignments, and representations. The IfcValveType is attached using the IfcRelDefinesByType objectified relationship and is accessible by the IsTypedBy inverse attribute. If the IfcValveType has ports or aggregated elements, such objects are reflected at the IfcValve occurrence using the IfcRelDefinesByObject relationship.

Property Use Definition The property sets relating to this entity are defined by IfcPropertySet and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. Property sets may also be specified at the IfcValveType, defining the common property data for all occurrences of the same type. They are then accessible by the IsTypedBy inverse attribute pointing to IfcValveType.HasPropertySets. If both are given, then the properties directly defined at IfcValve override the properties defined at IfcValveType. Refer to the documentation at the supertype IfcFlowController and ancestors for inherited property set definitions. The following property set definitions are applicable to this entity: (All Types)

Pset_ValvePHistory (PSET_PERFORMANCEDRIVEN) Pset_ValveTypeCommon (PSET_TYPEDRIVENOVERRIDE)

AIRRELEASE

Pset_ValveTypeAirRelease (PSET_TYPEDRIVENOVERRIDE)

DRAWOFFCOCK

Pset_ValveTypeDrawOffCock (PSET_TYPEDRIVENOVERRIDE)

FAUCET

Pset_ValveTypeFaucet (PSET_TYPEDRIVENOVERRIDE)

FLUSHING

Pset_ValveTypeFlushing (PSET_TYPEDRIVENOVERRIDE)

GASTAP

Pset_ValveTypeGasTap (PSET_TYPEDRIVENOVERRIDE)

ISOLATING

Pset_ValveTypeIsolating (PSET_TYPEDRIVENOVERRIDE)

MIXING

Pset_ValveTypeMixing (PSET_TYPEDRIVENOVERRIDE)

PRESSUREREDUCING

Pset_ValveTypePressureReducing (PSET_TYPEDRIVENOVERRIDE)

PRESSURERELIEF

Pset_ValveTypePressureRelief (PSET_TYPEDRIVENOVERRIDE)

Quantity Use Definition The quantities relating to this entity are defined by IfcElementQuantity and attached by the IfcRelDefinesByProperties relationship. They are accessible by the IsDefinedBy inverse attribute. The following base quantities are defined and shall be exchanged with the IfcElementQuantity.Name = ‘BaseQuantities’. Other quantities, being subjected to local standard of measurement, may be defined with another string value assigned to Name. In this case a valid value for MethodOfMeasurement shall be provided.

Qto_ValveBaseQuantities

Material Use Definition The material of the IfcValve is defined by IfcMaterialConstituentSet or as a fallback by IfcMaterial, and attached by the RelatingMaterial attribute on the IfcRelAssociatesMaterial relationship. It is accessible by the HasAssociations inverse attribute. Material information can also be given at the IfcValveType, defining the common attribute data for all occurrences of the same type. The following keywords for IfcMaterialConstituentSet.MaterialConstituents[n].Name shall be used:

Body: The primary material from which the object is constructed. Operation: Material from which the operating mechanism (such as gate, globe, plug, needle, or clack) of the valve is constructed.

Connection Use Definition The IfcValve may be connected to other objects as follows using the indicated relationship:

IfcActuator (IfcRelFlowControlElements): Indicates an actuator operating on the valve.

Port Use Definition The distribution ports relating to the IfcValve are defined by IfcDistributionPort and attached by the IfcRelConnectsPortToElement relationship. If the valve occurrence is defined by IfcValveType, then the port occurrences must reflect those defined at the IfcValveType using the IfcRelDefinesByObject relationship. Ports are specific to the IfcValve PredefinedType as follows indicated by the IfcDistributionPort Name, PredefinedType, and FlowDirection:

AIRRELEASE

Inlet (NOTDEFINED, SINK): Incoming fluid.

ANTIVACUUM

Outlet (NOTDEFINED, SOURCE): Outgoing fluid.

CHANGEOVER

Inlet (NOTDEFINED, SINK): Incoming fluid. Outlet#1 (NOTDEFINED, SOURCE): Switched outgoing fluid. Outlet#2 (NOTDEFINED, SOURCE): Switched outgoing fluid.

CHECK