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XIX. Setting and Testing
A. Pilot Valve Testing
The pilot valve must be adjusted for both set point
and blowdown on a test stand prior to its assembly
onto the main valve. Failure to do this can cause
incorrect blowdown readings. If the valve is to be
tested on the pressure vessel, it can successfully be
calibrated and tested for set pressure and blowdown.
ATTENTION!
To adjust blowdown when pilot is mounted to
main valve, test stand must be capable of flowing
the valve at name plate capacity.
B. Pilot Valve Test Stand
The pilot test stand should consist of the equipment
shown in Figure 31. All equipment must be rated to
at least the set pressure being tested. Test stand
requires:
1. Suitable pressure source with regulator.
2. cubic foot (14 liters) inlet side accumulator.
3. 1/30 cubic foot (1 liter) dome simulator.
4. Inlet and dome pressure gauges.
5. Inlet supply throttle valve.
6. Inlet supply vent/throttle valve.
7.
Inlet supply and dome simulator pressure
gauges.
The inlet accumulator and dome simulator should
be fitted with a drain valve at the lowest point in the
vessel to allow draining moisture before testing.
Throttle
ACCUMULATOR
© 2020 Baker Hughes Company. All rights reserved.
SOURCE
Valve
Drain
Valve
Figure 31: Pilot Test Stand
C. Pilot Valve Test Procedure
Definitions and guidelines
• Set Point: Point where vent pressure is felt
from port.
• Closing Point: Point where dome pressure
begins to reload.
• Blowdown: Set point minus closing point.
• Leakage will be checked for a one minute interval
pilots with Teflon O-Rings may leak on air test.
1. Mount pilot to pilot test stand shown in Figure 31.
2. Install a Swagelok elbow in the downward
position into the pilot vent port to facilitate
testing.
3. Remove Adjuster Cap.
4. Setting of 49PV07, 49PV37, AND 49MV07
(without modulator).
Inlet
Gauge
Drain
Valve
Drain
Valve
Pilot
Valve
Dome
Gauge
DOME
Consolidated 4900 MPV Series POSRV Manual
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Troubleshooting
