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VGD Series Double Valves
Specifications
Physical
Body materials
characteristics
Weight
Connections
Pipe connections
Pressure and vent taps
All VGDxx.xxxU gas valves are normally closed, two‐way valves. The valves have a standard,
Operation
integral, stainless steel mesh filter (0.9 mm) in the inlet to protect the downstream
components against contamination.
All valves have ¼ NPT ports for pressure test connection. A full size vent connection plate is
available as an accessory for VGD40.xxxU valves.
See Table 2 and 3 for details on ports and vent connection plates.
AGF10...
Siemens AG Building Technologies Division
Figure 1. Sectional view of VGD20.xxxU
VGD20.xxxU double valves consist of two valves in series.
The first (inlet) valve has a flat valve disc suitable for the safety shut‐off function only.
The second (outlet) valve has a contoured valve disc for stable regulating control and
smooth release of gas.
See Table 2
See Tables 4
NPT threads or ANSI class 150 flanges
(see Table 2)
See Tables 2 and 3
7631z50us/0815
Technical Instructions
Document Number CC1N7631us
November 08, 2017
AGF10...
Page 7
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