Siemens VRD Series User Manual

Technical Instructions VRD4 Series Double Valves
Document Number CC1N7649us
September 08, 2016
Page 6 Siemens AG Building Technologies Division
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.
7649z02/0514
V
1
V
2
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.

Siemens VRD Series Specifications

General

Brand	Siemens
Model	VRD Series
Category	Control Unit
Language	English