11 Troubleshooting
Issue Possible Causes
Leaking process fluid
• Clamp incorrectly installed onto valve
• Actuator seal failure
• Diaphragm failure
• Diaphragm not screwed on fully
• Valve damage
Leaking air • Actuator seal failure
Can’t open/close valve
fully
• Actuator failure
• Diaphragm failure
• Diaphragm not screwed on fully
Valve sticking or stuck
• Sticky diaphragm
• Actuator problem
Valve body issues
The most common valve body issues are:
• Valve damage - If you are having issues with leaking around the valve, inspect the
valve carefully for damage.
• Leaking diaphragm - If the clamp is not installed correctly, the diaphragm can leak
because of poor seating. Follow the assembly instructions carefully.
Actuator issues
The most common actuator issues are:
• Seal failure or leaking seal in a pneumatic actuator - The operator usually hears air
leaking from the valve during operation. In addition, the valve may not fully open or
close.
• Bends or damages the actuator shaft or handle caused by dropping the valve
assembly or actuator - When this occurs, the bent shaft or damaged handle may
keep the diaphragm from seating properly, resulting in process fluid leakage.
• Bent or improperly assembled actuator - If the valve does not assemble easily,
examine it carefully for damage. Do not force the valve together.
• The valve is not opening or closing easily - Double check the actuator to make sure
that it is assembled properly.
Diaphragm issues
Diaphragms are the high-wear components of valves and the most common point of failure.
Common causes of diaphragm failure are:
• Incorrect assembly - A diaphragm can wear prematurely if it isn’t installed properly
on the actuator and in the valve body.
• Actuator failure - Lack of servicing a pneumatic actuator can lead to a catastrophic
diaphragm failure. Actuators don’t need to be serviced often, but every year or so,
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