#### 7.3.2.7 IfcValveTypeEnum

The IfcValveTypeEnum defines the range of different types of valve that can be specified. These are typically used in conjunction with Pset_ValveTypeCommon, which contains common properties for all valve types.

Enumerated Item Definitions:

- AIRRELEASE: Valve used to release air from a pipe or fitting.
- ANTIVACUUM: Valve that opens to admit air if the pressure falls below atmospheric pressure.
- CHANGEOVER: Valve that enables flow to be switched between pipelines (3 or 4 port).
- CHECK: Valve that permits water to flow in one direction only and is enclosed when there is no flow (2 port).
- COMMISSIONING: Valve used to facilitate commissioning of a system (2 port).
- DIVERTING: Valve that enables flow to be diverted from one branch of a pipeline to another (3 port).
- DOUBLECHECK: An assembly that incorporates two valves used to prevent backflow.
- DOUBLEREGULATING: Valve used to facilitate regulation of fluid flow in a system.
- DRAWOFFCOCK: A valve used to remove fluid from a piping system.
- FAUCET: Faucet valve typically used as a flow discharge.
- FLUSHING: Valve that flushes a predetermined quantity of water to cleanse a toilet, urinal, etc.
- GASCOCK: Valve that is used for controlling the flow of gas.
- GASTAP: Gas tap typically used for venting or discharging gas from a system.
- ISOLATING: Valve that closes off flow in a pipeline.
- MIXING: Valve that enables flow from two branches of a pipeline to be mixed together (3 port).
- PRESSUREREDUCING: Valve that reduces the pressure of a fluid immediately downstream of its position in a pipeline to a preselected value or by a predetermined ratio.
- PRESSURERELIEF: Spring or weight loaded valve that automatically discharges to a safe place fluid that has built up to excessive pressure in pipes or fittings
- REGULATING: Valve used to facilitate regulation of fluid flow in a system.
- SAFETYCUTOFF: Valve that closes under the action of a safety mechanism such as a drop weight, solenoid etc.
- STEAMTRAP: Valve that restricts flow of steam while allowing condensate to pass through.
- STOPCOCK: An isolating valve used on a domestic water service.
- USERDEFINED: User-defined valve type.
- NOTDEFINED: Undefined valve type.

> HISTORY New type in IFC2.0.

XSD Specification:

<xs:simpleType name="IfcValveTypeEnum">
<xs:restriction base="xs:string">
<xs:enumeration value="airrelease"/>
<xs:enumeration value="antivacuum"/>
<xs:enumeration value="changeover"/>
<xs:enumeration value="check"/>
<xs:enumeration value="commissioning"/>
<xs:enumeration value="diverting"/>
<xs:enumeration value="drawoffcock"/>
<xs:enumeration value="doublecheck"/>
<xs:enumeration value="doubleregulating"/>
<xs:enumeration value="faucet"/>
<xs:enumeration value="flushing"/>
<xs:enumeration value="gascock"/>
<xs:enumeration value="gastap"/>
<xs:enumeration value="isolating"/>
<xs:enumeration value="mixing"/>
<xs:enumeration value="pressurereducing"/>
<xs:enumeration value="pressurerelief"/>
<xs:enumeration value="regulating"/>
<xs:enumeration value="safetycutoff"/>
<xs:enumeration value="steamtrap"/>
<xs:enumeration value="stopcock"/>
<xs:enumeration value="userdefined"/>
<xs:enumeration value="notdefined"/>
</xs:restriction>
</xs:simpleType>

EXPRESS Specification:

TYPE IfcValveTypeEnum = ENUMERATION OF (
| AIRRELEASE, ANTIVACUUM, CHANGEOVER, CHECK, COMMISSIONING, DIVERTING, DRAWOFFCOCK, DOUBLECHECK, DOUBLEREGULATING, FAUCET, FLUSHING, GASCOCK, GASTAP, ISOLATING, MIXING, PRESSUREREDUCING, PRESSURERELIEF, REGULATING, SAFETYCUTOFF, STEAMTRAP, STOPCOCK, USERDEFINED, NOTDEFINED);
END_TYPE;

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