Commissioning notes
Commissioning work must be carried out by qualified staff.
If environmental conditions produce corrosion (e.g. sea climate), apply protective coating.
Check wiring carefully prior to commissioning.
Standards
CE conformity in accordance with the directives of the European Union
- Directive for pressure equipment 97/23 EEC
- Directive for gas appliances 90/396 EEC
Service notes
Check the correct functioning and the internal and external tightness of the VGD... each time a
valve has been replaced. The valve may only be replaced by qualified staff.
VGD20
The double gas valves VGD20... are of the normally closed type and have 2 disks, one non-
contoured disk on the inlet side and one contoured disk on the outlet side. The stems are guided on
both sides of the disks, thus ensuring precise alignment and tight shutoff. The high closing force of
the return spring is supported by the prevailing gas pressure (class «A» to EN 161). A strainer on
the inlet side protects the valve and downstream controls against dirt. Valve body and connecting
flanges are made of die-cast aluminium, the seals of nitril rubber, and the stems of stainless steel.
The double gas valves feature a pilot gas connection Rp¾" . Gas valve, flanges and actuators are
supplied as separate
items. The 4 screws
required to fit the SKP...
to the valve are contained
in the terminal
compartment. No special
tools are required for
assembly. The
connecting flanges have
a test point. They are
internally threaded and
supplied as separate
items, together with the
necessary accessories, such as bolts, nuts, seals, etc. The overall flange dimensions and bore-holes
are identical, so that all types of flanges can be fitted to the double gas valve, irrespective of
nominal size. This means that a 1½" flange can be fitted to a 2" VGD... valve, and vice versa. Each
double gas valve requires 2 connecting flanges, which are to be ordered as separate items.
General Data
Class A (EN 161)
Group 2 (EN 161)
Types of gases gas families I, II, III (to G260 of DVGW) air
Built-in strainer, mesh size 0.9 mm
Perm. medium temperature -15...+60 °C
Mounting spring housing horizontal or vertical, pointing downward
Flanges for VGD40... to ISO 7005; PN16
Materials
- VGD20... die-cast aluminium
- VGD40... sand-cast aluminium
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