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14 G—GM-20/25 and GM-40/45 Series Dual-block Multi-function Gas Control Valves Technical Bulletin
The start gas pressure (P
plug is replaced and tightened. The pressure then rises to the setpoint (P
IMPORTANT: P
must be greater then P
G
operate properly.
Once the desired start gas pressure has been obtained, the outlet pressure
(P
) can be adjusted. To set the outlet pressure position, energize the
G
solenoid coil to open the valve seats. Remove an outlet pressure tap plug
from the valve body and measure the servo pressure regulator performance
and timing characteristics (see Figure 11). The adjustment scale (P
indicates the factory-set outlet pressure (see Figure 10), which can be
adjusted using the hexagonal tool provided (or an acceptable Allen
wrench) to obtain the desired servo pressure regulator performance and
timing characteristics.
Figure 11: Servo Pressure Regulator Performance vs.
Cycle the valve three times to check for proper performance, leaving a
minimum time of 20 seconds between cycles to evacuate the pressure
chamber.
) remains at the set level until the pressure tap
ST
ST
P
G
P
ST
Tim e (s)
3 to 12 S eco nds
Timing Characteristics
in order for the valve to
P
G
).
G
)
G
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