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PART II: INSTALLATION
Siemens VGD20.. e VGD40..
Siemens VGD20.. and VGD40.. gas valves - with SKP2.. (pressure governor)
- 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. 1).
WARNING: removing the four screws BS causes the device to be unserviceable!
SA
BS
BS
SKP1.
Gas valveversion with SKP2 (built-in pressure stabilizer)
T
Performance range (mbar)
Spring colour
Gas Filter (if provided)
The gas filters remove the dust particles that are present in the gas, and prevent the elements at risk (e.g.: burner valves, counters and
regulators) from becoming rapidly blocked. The filter is normally installed upstream from all the control and on-off devices.
ATTENTION: it is reccomended to install the filter with gas flow parallel to the floor in order to prevent dust fall on
the safety valve during maintenance operation.
BS
SA
BS
D
SKP2.
To replace the spring supplied with the valve group, proceed as follows:
- Remove the cap (T)
VR
- Unscrew the adjusting screw (VR) with a screwdriver
- Replace the spring
Stick the adhesive label for spring identification on the type plate.
0 - 22
15 - 120
neutral
yellow
TP
SIEMENS VGD..MOUNTING
POSITIONS
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.
Fig. 17
100 - 250
red
24
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