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GM-_ _4_
(Dual On/Off
Step-slow
Opening with
Pressure
Regulator)
GM-4_5_
(Dual On/Off
with Servo
Precision
Regulator)
G—GM-20/25 and GM-40/45 Series Dual-block Multi-function Gas Control Valves Technical Bulletin 13
This valve provides controls for step/slow opening (for smooth ignition)
and pressure regulation (for maintaining outlet gas pressure).
Refer to the GM-_ _3_ version for setting the gas pressure at the valve
outlet. For setting of the start gas position and maximum flow rate, see the
GM-_ _2_ version.
This valve provides servo regulation for precision control of the valve
outlet pressure. To set the valve for the desired outlet pressure, the start
gas pressure must be adjusted first.
To set the start gas position, energize the solenoid coil to open the valve
seats. Remove the pressure tap plug (see Figure 9) located below the gas
outlet pipe connection and measure the start gas pressure. The adjustment
scale (P
) indicates the factory-set start gas pressure (see Figure 10);
ST
therefore, a subsequent fine adjustment may be necessary. Use the
hexagonal tool provided (or an acceptable Allen wrench) to adjust the P
scale and obtain the desired start gas pressure.
Figure 9: Valve Outlet Pipe Connection
Figure 10: P
ST
6
10
2
P
ST
and P
Adjustment Scales (Metric Shown)
G
P ressure
Ta p P lug
P
G
5-50
ST
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