ASAHI AV VALVES Installation,Operation and Maintenance Manual
Diaphragm Valves Type 14 True Union Diaphragm Valves Type14
14
(11) Troubleshooting
Problem
Cause
Treatment
The travel stop is not set correctly.
Adjust the travel stop.
Solid particles have lodged in the
valve.
Clear the solid particles from the
valve.
Fluid is leaking past the fully closed
position.
Media has worn diaphragm and / or
weir.
Replace.
The diaphragm has pulled off the
stem.
Replace diaphragm. If the valve is in
vacuum service, special vacuum
valves may be required.
Consult factory.
Valve can not be fully open.
The metal joint failed.
Remove
Diaphragm & compressor and replace
joint.
The stem is broken.
Disassemble bonnet and replace the
stem.
The handle spins freely.
The metal joint failed.
Remove diaphragm & compressor
and replace joint.
Bonnet bolts have loosened.
Re-tighten.
Media has crystallized on the
diaphragm.
Disassemble and clean on a regular
basis. Replace failed diaphragm, if
necessary.
Valve leaks between body and bonnet.
The diaphragm has failed due to
fatigue.
Replace.
Valve leaks from stem.
The diaphragm has failed.
Replace.
(12) Handling of residual and waste materials
In discarding remaining or waste materials, be sure to ask a waste service company.
（
Poisonous gas is generated.
）
Caution
