The FlowControlDevices act like switches in the network (on/off), but do not form subnet controllers. The fittings correspond to those from the water and are usually in yellow color (the pictures were partly taken from the Water Solution).
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 Gate valve, https://www.avk-armaturen.de/de-de/produktsuche/absperrschieber/weichdichtende-absperrschieber/06-70-003,
 Flap  Ball valve |
Shut-off valve
The following basic types of shut-off valves are available in the domain networks with pipelines:
•Valve
•Flap
•Ball valve/Tap
•Valve
The distinction is made on the basis of the closing mechanism.
The gate valve (also gas gate valve) is a valve used to completely open or close the entire flow cross-section of a pipe. This is a wedge which can fully open and close the cross-section by lifting and lowering (vertically).
The shut-off flap have a flap lying in the axis, which can be closed by rotation. The cross-section is always reduced with flaps (horizontally and vertically).
The ball valve is also used in gas in facilities. Basically, it is a pierced ball which can be opened or closed by rotation.
The valve has a closing element (cone, ball, etc.), which is located in the direction of flow and can be pressed into the underlying opening.
In facilities, the shut-off valves also serve the maintenance of objects.
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 Flange spring pressure relief valve (https://www.leser.com/)
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Safety shut-off valve
This belongs to the safety devices and serves as a safeguard for the pressure in the system. As a rule, the maximum permissible pressure is safeguarded. In exceptional cases, it is also secured against pressure drop.
The symbol in schemes is often abbreviated with SAV or SSOVs in German-speaking countries. The symbol is shown like the shut-off valve according to DIN 2429-2 and a vertical line on the safeguarding side. Further information can be found in "Grundlagen der Gastechnik" Cerbe, 2004 (in German) page 198 ff.
Principle: A safety shut-off valve is not switched and always has the switching state switched on / on
 Own representation according to DIN 2429-2
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 Figure 1: https://www.erhard.de/produkte/produktauswahl-schmieding-range/hausanschlussprodukte/anbohrarmaturen-und-schellen/ventil-anbohrschellen-vas-pvc-fix/vas30-und-vas30-sc/ |
Tapping slider/tapping saddle with shut-off device
All tapping fittings are used in connection with the end-user. You always have a saddle (FittingElement > Saddle) which is drilled and mounted to an existing pipe. Only used for connections to the supply lines (DistributionLine), connection lines (ServiceLine) or internal connection lines (InternalServiceLine).
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Facility valve
Shut-off device within a facility.
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The excess flow valves are usually located directly behind the service entry and shut-off the gas supply if the volume flow is unnaturally high. In this way, gas accidents due to manipulation or defective gas lines can be reliably prevented. The flow monitor is currently not part of the Devices, as they cannot be switched on and off. The flow monitor is held in the Junctions in BuildingService/ExcessFlowValve.
The ZoneValve was not implemented, because it can be marked via an additional attribute or can be derived from the network formation-
