Cashco 2296HF User Manual
Page 11
11
IOM-2296
Possible Cause
Remedy
A. Excess pressure drop.
A. Bring pressure drop within design limits.
B. Bushing wear.
B. Replace bushing and stem.
C. Excessive cavitation in liquid service.
C1. Change operation parameters to relieve causes
of cavitation.
C2. Replace valve with valve equipped for cavitation control.
D. High outlet velocity.
D1. Reduce fl ow rate and/or pressure drop.
D2. Use multiple valves in series or in parallel.
D3. Increase outlet pipe size.
Possible Cause
Remedy
A. Excess pressure drop.
A1. Reduce pressure drop conditions.
A2. Convert to reduced trim.
B. Improper actuator bench setting.
B1. Calibrate actuator-to-valve.
B2. Assure proper engagement of act.stem to valve stem.
C. Metal seat design instead of composition seat design. C. Convert valve to composition seat.
3. Valve exhibits "excess" vibration.
4. Valve exhibits "excess" seat leakage.
Possible Cause
Remedy
A. Over-temperature.
A1. Bring process temperature to 400
°
F (205
°
C) or less.
A2. Remove insulation along bonnet; allow direct contact
with ambient air.
B. Misalignment.
B. Realign body-stem-actuator.
C. Wear.
C1. Remove dirt/grit from fl uid.
C2. Reduce cyclic travel.
D. Improper design for applied service.
D. Install alternate packing design.
E. Corrosion of stem.
E. Consider use of Model 987 or 988 or 989.
Possible Cause
Remedy
A. Loose threaded bonnet.
A. Re-tighten bonnet.
B. Improper bonnet draw down
B. Replace gasket and draw down bolting evenly in a
cross-pattern.
C. Corrosion.
C. Consider use of Model 987 or 988 or 989.
D. Warped bonnet and/or body fl ange.
D. Replace body and/or bonnet and bonnet gasket.
Draw down bonnet bolting evenly in a cross-pattern.
D. Excess wear.
D1. Oversized valve operating too close to seat, convert to
reduced trim.
D2. Remove particulate.
D3. Possible excess cavitation in liquid service, change
operation parameters.
D4. Re-lap plug-seat surface.
E. Misalignment.
E. Realign body-stem-actuator.
F. Composition seat failure.
F1. Replace soft seat.
F2. Remove "dirty" portion of fl uid causing failure.
G. Seat ring gasket failure.
G. Replace seat ring gasket.
5. Premature packing leakage.
6. Bonnet gasket leaking.