SPX W Series - Troubleshooting Guide; Leakage Issues; Valve Operation Problems; Electrical and Moisture Issues

Troubleshooting
Waukesha Cherry-Burrell
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Leakage
Leakage from vent/
Upper or lower seat ring failure.
Remove valve. Replace seat rings.
drain with valve closed.
Debris trapped in upper seat or
Inspect/change cleaning procedure to
lower seat.
correct.
Upper or lower seat not closed.
Inspect inner and outer stems for galling
and burrs on adapter.
Check actuator function.
Upper or lower seat clean
Check control sequence.
activated.
Leakage from vent/
Tri-ring on bottom of top seat
Replace seal.
drain with valve open.
failed.
Inspect inner and outer stems for galling
and burrs.
Small spring not holding upper
Check and replace small spring and stems
stem in place.
in actuator.
Leakage around yoke.
Internal adapter o-ring failure.
Replace o-ring.
External adapter o-ring failure.
Replace o-ring.
Leakage through outer
Inner stem o-ring failure.
Replace o-ring.
stem.
Operation
Valve fails to open.
Air pressure too low.
Set air pressure to 72 psi (5 bar) minimum.
Control failure.
Check control sequence.
Check control wiring and power source.
Valve fails to close.
Controls failed.
Check control sequence.
Check control wiring and power source.
Upper seat fails to lift
Lifting piston not adjusted
Adjust adjusting sleeve. See “Seat
during seat lift.
correctly.
Cleaning Adjustment” on page 22.
Lower seat fails to lift
Adjusting sleeve not adjusted
Adjust adjusting sleeve. See “Seat
during seat lift.
correctly.
Cleaning Adjustment” on page 22.
Actuator moves when
Clamp loose.
Tighten clamp with valve open.
valve opened.
Electrical
No valve closed or
Lower switch not adjusted
Adjust switch. See control module
open indication.
properly.
publications 95-03083 (2-piece) or 95-
03077 (3-Piece (obsoleted)).
No valve open signal.
Upper switch not adjusted.
Adjust switch. See control module
publications 95-03083 (2-piece) or 95-
03077 (3-Piece (obsoleted)).
Moisture in switch
Missing and/or damaged gaskets.
Replace gaskets.
housing.
10/2012
95-03087
Page 85