Flowserve PMV P4 Manual do Utilizador descarregar pdf (Página 24)

Note: All PMV-positioners are serialized.

Please note down, and provide the serial

number when contacting the factory for trou-

ble shooting or service.

Signal change has no effect on the actuator

position.

— Check indicator and screw.

— Check air supply to positioner and tubing

to the actuator.

— Check input signal to positioner.

— Check diaphragm for damage or leakage.

— Check pilot valve function.

— Check cam for correct setting.

— Check I/P output

Signal change results in actuator running to

end positions.

— Check coupling between positioner and

actuator.

— Check cam position and locking screw.

— Check input signal.

Inaccurate positioning.

— Dirty or worn pilot valve.

— Defective or leaking diaphragm.

— Input signal fluctuates.

— Incorrect sizing of actuator.

— Valve/actuator ”stiction”.

— High valve/actuator breakaway torque.

— Loose cam.

15. Trouble shooting

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Flowserve PMV P4 Manual do Utilizador Página 24