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Technical Instructions
Document Number CC1N7649us
September 08, 2016
Operation
All VRD40.xxxUx gas valves are normally closed, two-way valves. The valves have a standard,
integral, stainless steel mesh filter (0.9 mm) in the inlet to protect the downstream
components against contamination.
VRD40.xxxUx double valves consist of two valves in series. Each valve has a double seat to
achieve high flow (see Figure 1).
All valves have ¼-inch NPT ports for pressure test connection. A full size vent connection plate
is available as an accessory.
See Table 2 and 3 for details on ports and vent connection plates.
Figure 1. Sectional view of VRD40.065UF
Closing springs:
Each double seat uses one pair of springs. The spring forces act separately as closing forces on
the individual valve seats.
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V1
V2
7649z02/0514
Siemens AG Building Technologies Division
VRD4 Series Double Valves
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