Siemens VGD4 series Operation Manual And Mounting Instructions page 2

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Building Technologies
1 Use
The combination of the SKPx5 actuator and VGD4/VRD4 double gas valve takes on
the functions of a
∂
Safety shutoff valve (SKP15)
∂
Safety shutoff valve with specific pressure control (SKP25)
1.1 SKP15 actuator
The electrohydraulically operated SKP15 gas fittings together with VGD4/VRD4 work
exclusively as a safety shutoff valve (OPEN/CLOSED) and are used primarily on gas-
fired combustion plant. They open slowly and close rapidly. The SKP15 actuator can be
supplied with end switches including a valve stroke display or without an end switch or
valve stroke display.
1.2 SKP25 actuator
The electrohydraulically operated SKP25 gas fittings together with VGD4/VRD4 work
as a safety shutoff valve (OPEN/CLOSED) and are also used as a gas pressure
governor. This controls the gas pressure on the outlet side according to the setpoint
value established by means of a setpoint spring. The SKP25 actuator can be supplied
with or without an end switch.
The valve stroke display is generally provided.
Operation Manual and Mounting Instructions VGD4 / VRD4 / SKPx5 CC1U7643en
14.03.2018