XXI. 4900 Series POSRV Options (Cont.)
G. Pilot Valve Tester
(Figure 41)
The pilot valve test indicator is available for the
modulating and 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.
H. Pressure Differential Switch
(Figure 42)
Electrical:
A pressure differential switch 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.
I. Remote Sensing
The pilot valve inlet may be piped to a location
remote from the main valve. In this application,
the customer may pipe the inlet sensing line to
some location other than where the main valve is
located and where the pressure will be relieved (for
tubing size and maximum length, consult factory for
recommendations.)
Consolidated 4900 MPV Series POSRV Manual
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© 2020 Baker Hughes Company. All rights reserved.
Figure 42: Pressure Differential Switch
(Shown with Optional 5-way Manifold Valve)
Figure 41: Pilot Valve Tester
Figure 40: Electrical Blowdown Valve
