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VGD Series Double Valves
Application
All VGDxx.xxxU valves can be combined with any SKPxx.xxxU series actuator. The actuator
can be mounted while the valve is installed and under pressure.
SKPxx.xxxU regulating actuators are applicable for both low and high supply gas pressure
applications, eliminating excessive regulator inventories. Maximum pressure ratings vary
with valve size (see Table 2).
All VGDxx.xxxU valves perform these functions in combination with each of the following
actuators:
SKP15.xxxU
SKP25.xxxU
SKP55.xxxU
SKP75.xxxU
Since more than one function can be performed by a single valve, fewer components and
fittings are required‐significantly reducing both the size and weight of the gas train. In
addition, smaller diameter gas valves can be used. For details on valve sizing see the flow
chart (figure 3).
Siemens AG Building Technologies Division
Safety shut‐off
Safety shut‐off and constant pressure regulation or zero governor
Safety shut‐off, pressure regulation and differential pressure air‐gas ratio
control
Safety shut‐off, pressure regulation and adjustable air/gas ratio control
CAUTION:
Do not oversize valves equipped with a regulating SKP2x.xxxU / SKP5x.xxxU /
SKP7x.xxxU actuator. Oversizing may limit turndown and could cause oscillations.
Technical Instructions
Document Number CC1N7631us
November 08, 2017
Page 3
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