Siemens VRD40.080UF Technische instructies - Pagina 2
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Technical Instructions
Document Number CC1N7649us
September 08, 2016
UL listed, FM approved, CSA certified, ISO 9001 and 14000 certified. CE approved versions
Features
All Models
Suitable for biogases, process gases, natural gas and air
Stainless steel mesh inlet filter protects the valve seats as well as downstream components
¼" NPT inlet and outlet pressure taps (see Table 2 for details)
Dual stem guides ensure precise disc alignment and tight shut-off
Strong sealing force, withstands up to 4 psi differential back pressure
Valves connected with SKP... actuators open slowly and close rapidly
Compact VRD40.xxxUx double-valve bodies consist of 2 safety shut-off valves in series
Each individual safety shut-off valve has double seats to achieve high flow
Patented seat construction with individual closing spring for each seat to assure reliable
Full port vent line connection plates are available
Application
VRD40.xxxUx valves can be combined with any SKP... series actuator. The actuator can be
mounted while the valve is installed and under pressure.
SKP... 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 VRD40.xxxUx valves perform these functions in combination with each of the following
actuators:
SKP15...
SKP25...
SKP55...
SKP75...
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 charts (figures
2).
Page 2
available
shut-off and high close-off pressure rating
NOTE:
VRD40.xxxUx valves and AGA40.xxxxU vent connection plates must be ordered as
separate items (see Table 2).
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 SKP2... / SKP5... / SKP7... actuator.
Oversizing may limit turndown and could cause oscillations.
VRD4 Series Double Valves
Siemens AG Building Technologies Division