Waukesha Cherry-Burrell Brand W71/W72RS Sch. 5 Mix Proof Valves
Troubleshooting
08/2018
95-03091
Page 61
Troubleshooting
PROBLEM
POSSIBLE CAUSE
SUGGESTED ACTION
Leakage
Leakage from vent/
drain with valve closed.
Upper or lower seat ring failure.
Remove valve. Replace seat rings.
Debris trapped in upper seat or
lower seat.
Inspect/change cleaning procedure to
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
activated.
Check control sequence.
Leakage from vent/
drain with valve open.
Tri-ring on bottom of top seat
failed.
Replace seal.
Inspect inner and outer stems for galling
and burrs.
Small spring not holding upper
stem in place.
Check and replace small spring and stems
in actuator.
Leakage around yoke.
Internal adapter o-ring failure.
Replace o-ring.
External adapter o-ring failure.
Replace o-ring.
Leakage through outer
stem.
Inner stem o-ring failure.
Replace o-ring.
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
during seat lift.
Lifting piston not adjusted
correctly.
Adjust adjusting sleeve. See “Seat
Cleaning Adjustment” on page 25.
Lower seat fails to lift
during seat lift.
Adjusting sleeve not adjusted
correctly.
Adjust adjusting sleeve. See “Seat
Cleaning Adjustment” on page 25.
Actuator moves when
valve opened.
Clamp loose.
Tighten clamp with valve open.
Electrical
No valve closed or
open indication.
Lower sensor not adjusted
properly.
Adjust sensor. See control module
publication 95-03083.
No valve open signal.
Upper sensor not adjusted.
Adjust sensor. See control module
publication 95-03083.
Moisture in sensor
housing.
Missing and/or damaged gaskets. Replace gaskets.
Summary of Contents for W71
Page 63: ......