12
TROUBLESHOOTING GUIDE
SYMPTOM
CAUSE
DIAPHRAGM VALVE REMEDY
7.
Water leaks out at
valve
A.
Leaking round pipe
connections
Tighten connections (use PTFE thread tape only).
B. Leaking between
bonnet and body
Check that diaphragm washer is properly in place. Tighten bonnet
screws. If still leaking evaluate for replacement with model number ap-
propriate for your valve. Refer to the last page for replacement parts or
call our Technical Service hotline for assistance in identifying valve or
part numbers. 1-800-RAIN-BIRD
8.
Valve slams on/off
(water hammer)
A.
Excessive water
pressure
Install pressure regulator on line before valves to reduce pressure.
B.
Valve closing/
opening mechanism
worn
Replace diaphragm with model number appropriate for your valve. Re-
fer to the last page for replacement parts or call our Technical Service
hotline for assistance in identifying valve or part numbers. 1-800-RAIN-
BIRD
C.
Air bubble in line
Shut off water at main shut off valve and drain the line to release air
bubble. Slowly refill the line.
D.
Valve too small for
amount of flow
Replace with larger valve.
E.
Pipe is too small for
the flow
Use larger pipe which will slow the velocity of water leading up to the
valve and reduce water hammer.
9.
Water runs continu-
ously when valve is
not activated; shuts
off when valve is acti-
vated.
A.
Valve installed
backwards
Reinstall valve according to arrows on valve depicting direction of flow.
