Trouble Shooting - Baker Hughes Consolidated 4900 Series Instruction Manual

XX. Trouble Shooting
Problem
Blowdown incorrect
Leakage around fittings
Leakage under the
Coverplate 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
70 |
Baker Hughes
Table 8: Trouble Shooting Chart
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. Coverplate O-Ring is damaged.
B. Cap Screws or Stud Nuts on
Coverplate are loose.
A. Damaged Seat O-Ring
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. Closed Filter
D. Spring not installed.
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
Coverplate O-Ring.
B. Tighten as required.
A. Disassemble valve and replace
Seat O-Ring.
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. Install Spring.
A. Adjust operating pressure.
B. Disassemble and replace O-Ring
or Spring Seals
A. Install Backflow Preventer.
B. Install Backflow Preventer
© 2020 Baker Hughes Company. All rights reserved.