XXI. Troubleshooting
Table 18: Troubleshooting 2900 Series POSRV’s
Problem
Possible Cause
Corrective Action
Blowdown incorrect
A. Incorrect Adjuster Assembly set-
ting
A. Re-set Adjuster Assembly (See Pilot
Valve Setting)
Leakage around fit
-
tings
A. Fittings are not tightened or are
cross threaded.
A. Re-install fittings correctly
B. Did not install Teflon tape or pipe
sealant.
B.
Re-install fittings with Teflon tape or
pipe sealant.
Leakage under the
Cover Plate when
valve is open.
A. Guide or Cover Plate Gasket/O-
ring is damaged.
A. Disassemble valve and replace Cover
Plate Gasket/O-ring.
B.
Cap Screws or Stud Nuts on
Cover Plate are loose.
B. Tighten as required.
Main Valve leaks
through
the Seat
A. Damaged Seat O-Ring
A. Disassemble valve and replace Seat
O-Ring.
B. Damaged Metal Seat
B. Disassemble valve and lap Metal Disc
and/or Nozzle.
C. Metal Seat is not lapped in prop-
erly to Disc Holder
C. Disassemble Disc and Disc Holder to
lap two together properly
D.
Seat too wide
D. Recheck Tables 3 and 4
Main Valve leaks un-
der the Nozzle Seat
A. Damaged Nozzle O-Ring
A. Disassemble Main Valve and replace
damaged Nozzle O-Ring.
Pilot Valve is not
opening at set pres-
sure and Main Valve
will not open
A. Wrong set pressure
A. Readjust the set pressure of the valve.
Main Valve does not
close upon start up.
P2 chamber does
not load with system
pressure.
A. Start-up procedures pressurize
the valve too rapidly.
A.
Slowly increase the inlet pressure.
B. Sensing Tube is installed upside
down.
B. Re-install Sensing Tube correctly.
C. Closed Filter
C. Clear or replace Filter.
D. Main Valve Piston is not resting
on nozzle.
D.
Push the Main Valve Piston down to
nozzle through the compression fitting
on top of the Cover Plate.
Leakage through the
Pilot Valve
A. Operating pressure too high
A. Adjust operating pressure
B. O-Ring or Spring Seal degradation B. Disassemble and replace O-Ring or
Spring Seals
Main Valve opens
and allows the dis
-
charge media to flow
back into the pres-
sure vessel
A.
Back pressure is greater than set
pressure and forces the Main Disc
up, and the media flows backward
into the vessel.
A.
Install Backflow Preventer
B.
Discharging into a closed contain-
er or not enough capacity in the
discharge system.
B.
Install Backflow Preventer.
Consolidated 2900 Series Generation II POSRV Instruction Manual
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