Document No.:KE-4011-03 Page: 14/27
18.7 Ensure to carry out the following inspections periodically. Do it as frequently as possible for safe
and trouble-free operation of actuators and actuated valves.
◇ Check the fully open or closed position of a valve.
◇ Ensure that the valve opening or closing range is correctly maintained in accurate response to a
signal currency or a signal pressure of actuators and accessories.
◇ Check the air leakage through all air tubing connections and valves.
◇ Check an abnormal noise generated from the air tubing or valves.
◇ Check vibration of actuators and valves.
◇ Ensure that all bolts and nuts are securely tightened.
Don
t use any spindle oil or gear oil for lubrication of actuators and accessories
An abnormal noise may be generated due to valve seat galling ( valve seats
getting stuck with foreign objects ) or blockage of actuator air tubing caused by
internal residues. Take corrective measures immediately, since damage of valve
seats and malfunction of actuators and valves may be caused by negligence of
such problems.
Ensure to replace terminals of electric devices, if needed, with those designed
with the same specifications. Different design specifications could be a cause
of technical troubles.
Leaving an abnormal vibration of actuators and valves also causes equipment
failure. Support the piping system securely.
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