PART II: INSTALLATION
18
Siemens VGD20.. and VGD40.. gas valves - with SKP2.. (pressure governor)
Mounting
z
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;
z
install the valve;
z
the direction of gas flow must be in accordance with the direction of the arrow on the valve body;
z
ensure that the bolts on the flanges are properly tightened;
z
ensure that the connections with all components are tight;
z
make certain that the O-rings and gaskets between the flanges and the double gas valve are fitted.
z
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.
Siemens VGD valves with SKP actuator:
The pressure adjusting range, upstream the gas valves group, changes according to the spring provided with the valve group.
Caution: the SKP2 diaphragm D must be vertical (see Fig. 6).
WARNING: removing the four screws BS causes the device to be unserviceable!
Performance range (mbar)
0 - 22
15 - 120
100 - 250
Spring colour
neutral
yellow
red
BS
BS
SKP1.
SKP2.
BS
BS
SA
SA
TP
D
SIEMENS VGD..MOUNTING
POSITIONS
2
(cap)
1
(spring)
Fig. 6
