I. Lifting Lever
This is an external, physical means of allowing the
pilot valve to relieve dome pressure so that the main
valve can open.
J. Manual, Electrical, or Pneumatic
Blowdown Valve
(Figures 86 & 87)
An optional manual blowdown valve is available for
relieving the pilot operated safety relief valve.
Consult factory for applications requiring a pneumatic
or electrical solenoid blowdown valve which may be
connected to a distant location, such as an operator
station, for remote actuation. The blowdown valve is
ported directly to the main dome area, so that the
media in the dome is vented when the blowdown
valve is actuated, thus allowin
g the main valve to
open.
K. Pressure Differential Switch
Electrical: A pressure differential switch (Figure
88) 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.
L. Pressure Spike Snubber
Baker Hughes recommends the use of a pressure
spike snubber (Figure 89) for all applications which
may have high frequency pressure spikes. The
pressure spike snubber is designed to dampen the
pressure spikes which could cause unnecessary
parts wear or premature valve opening.
Figure 86: Manual Blowdown Valve
Figure 87: Electrical Blowdown Valve
Figure 88: Pressure Differential Switch
Figure 89: Pressure Spike Snubber
XXII. 2900 Pilot Valve Options (Cont.)
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Baker Hughes
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