Scope Of Manual; Advantages Of The Combination Chamber Vrp-B-Ch Pilot Controllers; Applications - GE Becker VRP-B-CH Series Instruction Manual

Scope of Manual

This manual provides information on the installation, operation,
adjustment, and maintenance of the Becker VRP-B-CH double-
acting pilot. For information concerning actuators, valves, and
accessories, refer to the instruction manuals provided with the
specific product.
Note: Only those qualified through training or experience
should install, operate, or maintain Becker pilots. If there are any
questions concerning these instructions, contact your GE sales
representative or sales office before proceeding.
Advantages of the Combination
Chamber VRP-B-CH Pilot Controllers
1. The Spring is protected against corrosion caused by exposure
to the outside weather conditions and condensation.
2. Small net force will be transferred to the pilot body resulting in
negligible dead band shift when changing setpoint.
3. Because the need for a flat diaphragm for some pilot models
is eliminated, only 5 pilot model numbers are needed, instead
of 11, and there is less troubleshooting during assembly.
4. The VRP-B-CH pilots will have only 3 diaphragms (as opposed
to 5).
5. Larger measured variable chamber volume and surface area
dampens control pressure signal, helping to compensate for
vibration induced by poor location of sensing tap in area of
flow pulsation and turbulence.
6. Number of fittings and tubing is minimized with "manifold"
body design.
7. Sensing gauge is brought up to eye level.
8. Control springs can be replaced without disturbing
any diaphragms.
9. Springs are guided by the outside resulting in less likelihood
of friction from poorly aligned spring.
10. The accuracy of pilots is guaranteed to be ±3/4 percent.

Applications

• Primary pressure control
• Overpressure protection (monitor)
• Underpressure protection (standby)
• Relief valve
• Backpressure control
• Unique "Bleed to Pressure System" BPS*
(when feature can be utilized)
• Any large downstream systems (city gate stations,
inter-system pressure limiting)
• Suction control to reciprocating compressors
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Guidelines for Usage
Large downstream systems:
City gate stations, inter-system pressure limiting, overpressure
protection for custody transfer stations, and mainline relief valve
applications are all suited to this pilot.
No "Low" pressure available:
The low steady state consumption of the pilot makes it a first
choice for any pressure control application covered above in
which the downstream pressure exceeds 300 psig and there
are no alternative pipeline systems nearby operating below
300 psig as well. Without a system to "dump" the pilot bleed gas,
the VRP-B-CH makes an exceptional choice since it bleeds
<10 scfh while in control at steady state.
The Becker BPS* Bleed to a pressure system:
When adjusted to bleed to a pressure system, the VRP-B-CH
sensitivity is set up to open the internal balance valves for further
control accuracy. This adjustment places the gas consumption
rate of the VRP-B-CH pilot equal to that of the VRP-CH pilot.
Compatible Actuators:
• Becker RPDA Actuators (Rotary Piston Double-Acting)
• Becker LPDA Actuators (Linear Piston Double-Acting)
• Other manufacturer's double-acting piston actuators
Retrofit Compatibility:
Optimum performance is achieved by pairing the VRP-B-CH
with genuine Becker control valve actuators. Should you already
have existing control valve actuator(s) in service, the addition of a
VRP-B-CH can improve performance and minimize atmospheric
bleed emissions.
Some compatible actuators:
• Bettis T-Series piston actuators
• Rotork Series XX actuators
• Fisher Type 470 piston actuators
• Fisher Type 1061 piston
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Consult GE for additional information.
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Becker VRP-B-CH Series Valve Regulator Pilot Instruction Manual | 2
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