16
TROUBLESHOOTING
Problem Possible Cause
Equipment not shutting off or it does not appear
to be enough force when air is removed from the
actuator.
Not enough spring load. Check the spring load by following section
on "Setting the Actuator Spring Load".
When air is supplied to the actuator the actuator
is not fully stroking or giving enough load.
Check air supply pressure to the requirements of the initial actuator
sizing. Check for seal leakage by using a "leak detect solution". Make
sure you also check the stem boot seal for reverse acting actuators.
Replace seals as necessary.
When air is removed from the actuator the
actuator does not return to either the open or
closed position.
Check for blockage in equipment. Check for a broken spring.
An air control signal is being sent to the actuator
but the actuator does not fully stroke?
Check the bench range of the actuator by reviewing the original
specifications for the actuator.
Actuator does not move smoothly Check that valve packing is not over tightened. Check that spring is not
rubbing on sides of spring case.
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