
60 | BHGE
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J. Pilot Valve Tester
The pilot valve test indicator (Figure 53) is available for the pop
action pilot valves. The valve test indicator measures the set
pressure of the pilot, while maintaining pressure on the main
valve dome area; thereby, allowing only the pilot to actuate.
K. Pressure Differential Switch
Electrical: A pressure differential switch (Figure 54) is available
which may be wired to an operator station or some other remote
location. The switch will provide a signal that indicates when the
main valve is opening. The standard pressure differential switch
is a single pole, double throw, rated at 5 amps and 30 volts DC
with a NEMA 4 enclosure. (For other configurations, consult the
factory.)
Pneumatic: For applications that do not permit an electrical
differential switch, an option is available to provide pneumatic
signal to indicate when the main valve opens.
Figure 53: Pilot Valve Tester
Figure 54: Pressure Differential Switch
(Shown with optional 5-way manifold valve
and sensing ring)
XXII. 2900-40 Series POSRV Options (Cont.)