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XXI. Troubleshooting
Problem
Blowdown incorrect
Leakage around fittings
Leakage under the Cover Plate
when valve is open.
Main Valve leaks through the
Seat
Main Valve leaks under the
Nozzle Seat
Pilot Valve is not opening at set
pressure and Main Valve will not
open
Main Valve does not close upon
start up. P2 chamber does not
load with system pressure.
Leakage through the Pilot Valve
Main Valve opens and allows the
discharge media to flow back
into the pressure vessel
54 | BHGE
Table 13: Troubleshooting 2900-40 Series POSRV's
Possible Cause
A.
Incorrect Adjuster Assembly setting
A.
Fittings are not tightened or are cross
threaded.
B.
Did not install Teflon tape or pipe
sealant.
A.
Guide or Cover Plate Gasket/O-ring is
damaged.
B.
Cap Screws or Stud Nuts on Cover
Plate are loose.
A.
Damaged Seat O-Ring
B.
Damaged Metal Seat
C.
Metal Seat is not lapped in properly to
Disc Holder
D.
Seat too wide
A.
Damaged Nozzle O-Ring
A.
Wrong set pressure
A.
Start-up procedures pressurize the
valve too rapidly.
B.
Sensing Tube is installed upside down.
C.
Clogged Filter
D.
Main Valve Piston is not resting on
nozzle.
A.
Operating pressure too high
B.
O-Ring or Spring Seal degradation
A.
Back pressure is greater than set
pressure and forces the Main Disc up,
and the media flows backward into the
vessel.
B.
Discharging into a closed container or
not enough capacity in the discharge
system.
Corrective Action
A.
Re-set Adjuster Assembly (See Pilot Valve
Setting)
A.
Re-install fittings correctly
B.
Re-install fittings with Teflon tape or pipe
sealant.
A.
Disassemble valve and replace Cover Plate
Gasket/O-ring.
B.
Tighten as required.
A.
Disassemble valve and replace Seat O-Ring.
B.
Disassemble valve and lap Metal Disc and/
or Nozzle.
C.
Disassemble Disc and Disc Holder to lap two
together properly
D.
Recheck Tables 3 and 4
A.
Disassemble Main Valve and replace
damaged Nozzle O-Ring.
A.
Readjust the set pressure of the valve.
A.
Slowly increase the inlet pressure.
B.
Re-install Sensing Tube correctly.
C.
Clear or replace Filter.
D.
Push the Main Valve Piston down to nozzle
through the compression fitting on top of the
Cover Plate.
A.
Adjust operating pressure
B.
Disassemble and replace O-Ring or Spring
Seals
A.
Install Backflow Preventer
B.
Install Backflow Preventer.
© 2019 Baker Hughes, a GE company. All Rights Reserved.
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