Pilot Valve Tester; Pressure Differential Switch - GE Baker Hughes 2900-40 Series Maintenance Manual

Pilot operated safety relief valve

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XXII. 2900-40 Series POSRV Options (Cont.)

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.

Figure 53: Pilot Valve Tester

60 | BHGE

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 54: Pressure Differential Switch

(Shown with optional 5-way manifold valve

and sensing ring)

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