Siemens Vgd20 - Unigas RX90 Installation Manual

Siemens VGD20.. and VGD40.. gas valves - with SKP2.. (pressure governor)
Mounting
When mounting the VGD.. double gas valve, two flanges are required (as for VGD20.. model, the flanges are threaded);

to prevent cuttings from falling inside the valve, first fit the flanges to the piping and then clean the associated parts;

install the valve;

the direction of gas flow must be in accordance with the direction of the arrow on the valve body;

ensure that the bolts on the flanges are properly tightened;

ensure that the connections with all components are tight;

make certain that the O-rings and gaskets between the flanges and the double gas valve are fitted.

Connect the reference gas pipe (TP in figure; 8mm-external size pipe supplied loose), to the gas pressure nipples placed on the

gas pipe, downstream the gas valves: gas pressure must be measured at a distance that must be at least 5 times the pipe size.
Leave the blowhole free (SA in figure). Should the spring fitted not permit satisfactory regulation, ask one of our service centres for a
suitable replacement.
Caution: the SKP2 diaphragm D must be vertical (see Fig. 10).
WARNING: removing the four screws BS causes the device to be unserviceable!
BS
BS
SKP1. SKP2.
Fig. 8
BS SA
BS
Fig. 9
TP
TP
D
Fig. 10
Fig. 12
22
SIEMENS VGD..MOUNTING
POSITIONS
7631z05/0101
Fig. 11