Unigas R75A, Руководство по установке, использованию и обслуживанию, Страница: 21 / 48

PART II: INSTALLATION
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3.4 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.
Once the gas train in installed, execute the electrical connections for all its items (gas valves group, gas proving system, pressure
switches).
Caution: the SKP2 diaphragm D must be vertical (see Fig. 7).
WARNING: removing the four screws BS causes the device to be unserviceable!
Fig. 15
Fig. 16
Fig. 17
Performance range (mbar)
0 - 22 15 - 120 100 - 250
Spring colour
neutral yellow red
BS
BS
SKP1. SKP2.
BS
BS
SA
SA
TP
D
7631z05/0101
SIEMENS VGD..MOUNTING
POSITIONS
2
(cap)
1
(spring)
Fig. 18