Installation, Operation and Maintenance Manual
󲷇H-A058-E-12󲷈 Diaphragm Valve, True Union Diaphragm Valve (15-50mm, 1/2”-2”) Pneumatic Actuated Type AI
28
Problem
Cause
Treatment
Fluid leaks from the valve
even when the valve is closed
fully.
The diaphragm is worn.
Replace the diaphragm with a new
one.(Refer to pages 26)
The diaphragm or the body is scratched.
Replace scratched parts with new
one.(Refer to pages 26)
Foreign matter is in the valve.
Disassemble valve to remove foreign
matter.(Refer to pages 26)
The operating pressure is low.
Check the operating pressure.
Fluid leaks from the valve.
The bolt between the body and actuator is loose.
Tighten up the bolt to the specified
torque.(Refer to page 26)
The diaphragm or the body is scratched.
Replace scratched parts with new
one.(Refer to pages 26)
There is foreign matter between the diaphragm
and the body.
Disassemble valve to remove foreign
matter.(Refer to pages 26)
The union nut is loosened.
Tighten the union nut.
The O-ring is scratched or worn.
Replace the O-ring with a new one.
The actuator operates, but the
valve does not open or close.
The diaphragm or the joint metal fitting is
broken.
Replace broken parts.(Refer to pages
26)
(19) Handling of residual and waste materials
- Make sure to consult a waste treatment dealer for recommendations on the proper disposal of plastic valves.
(Poisonous gas is generated when the valve is burned improperly.)
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