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Waukesha Cherry-Burrell
Troubleshooting
PROBLEM
Leakage
Leakage from vent/drain with
valve closed.
Leakage from vent/drain with
valve open.
Leakage around yoke.
Leakage through outer stem.
Operation
Valve fails to open.
Valve fails to close.
Upper seat fails to lift during seat
lift.
Lower seat fails to lift during seat
lift.
Actuator moves when valve
opened.
Electrical
No valve closed or open indication.
No valve open signal.
Moisture in switch housing.
August 2008
POSSIBLE CAUSE
Upper or lower seat ring failure.
Debris trapped in upper seat or lower
seat.
Upper or lower seat not closed.
Upper or lower seat clean activated.
Tri-ring on bottom of top seat failed.
Small spring not holding upper stem
in place.
Internal adapter o-ring failure.
External adapter o-ring failure.
Inner stem o-ring failure.
Air pressure too low.
Control failure.
Controls failed.
Lifting piston not adjusted correctly.
Adjusting sleeve not adjusted
correctly.
Clamp loose.
Lower switch not adjusted properly.
Upper switch not adjusted.
Missing and/or damaged gaskets.
95-03076
Troubleshooting
SUGGESTED ACTION
Remove valve. Replace seat rings.
Inspect/change cleaning procedure to correct.
Inspect inner and outer stems for galling and
burrs on adapter.
Check actuator function.
Check control sequence.
Replace seal.
Inspect inner and outer stems for galling and
burrs.
Check and replace small spring and stems in
actuator.
Replace o-ring.
Replace o-ring.
Replace o-ring.
Set air pressure to 72 psi (5 bar) minimum.
Check control sequence.
Check control wiring and power source.
Check control sequence.
Check control wiring and power source.
Adjust adjusting sleeve. Outer stem should
move.12" (3 mm). See "Seat Lifting
Adjustment" on page 17.
Adjust adjusting sleeve. Inner stem should
move.28" (7.1 mm). See "Seat Lifting
Adjustment" on page 17.
Tighten clamp with valve open.
Adjust switch. See "Switch Adjustment" on
page 23.
Adjust switch. "Switch Adjustment" on
page 23
Replace gaskets.
Page 31
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