26 |
Baker Hughes
© 2020 Baker Hughes Company. All rights reserved.
XV. Trouble Shooting The 1811 Valves
Problem
Possible Cause
Corrective Action
Valve does not go
into full lift.
A. Upper ring positioned too high
A. Lower upper adjusting ring
B. Foreign material trapped between
disc holder & guide
B. Disassemble valve and correct any
abnormality. Inspect system for
cleanliness.
Failure to open at
set pressure Simmer
A. Improper compression screw
adjustment
A. Adjust set pressure
B. Lower ring positioned too low.
B. Raise lower adjusting ring
C. Steam line vibrations
C. Investigate and correct cause
Valve Leaking and/
or exhibits erratic
popping actions.
A. Damaged seat
A. Disassemble valve, lap seating
surfaces, replace disc if required.
B. Part misalignment
B. Disassemble valve, inspect contact
area of disc and seat bushing,
lower spring washer or spindle,
compression screw, spindle
straightness, etc.
C. Operating too close to set pressure
C. Lower operating pressure and/or
retrofit to Thermodisc design.
D, Discharge stack binding on valve
outlet
D, Correct source of binding
Hang-up, or valve
does not close
completely.
A. Lower ring positioned too high
A. Move lower ring to the left one notch
per adjustment and test. Repeat until
problem is eliminated.
B. Foreign material
B. Disassemble valve and correct any
abnormal condition. Inspect system
for cleanliness.
C. Improper disc/guide clearance
C. Verify proper clearance
Excessive blowdown A. Upper ring positioned too low.
A. Raise upper adjusting ring
B. Built up back pressure excessive
B. Decrease exhaust pressure by
increasing discharge stack area.
Chatter or short
blowdown
A. Upper ring positioned too high
A. Lower upper adjusting ring
B. Excessive inlet piping pressure drop
B. Reduce inlet pressure drop to less
than one-half of required valve
blowdown by redesigning inlet
piping.
C. Valve size improper for application
C. Verify valve sizing
