26
Troubleshooting
12 TROUBLESHOOTING
Table 6: Troubleshooting
Troubleshooting
FAILURE
POSSIBLE CAUSES
CORRECTIVE MEASURES
Erratic movement
Irregular supply of operating medium.
Verify the supply pressure and correct as necessary.
Worn parts.
Dismantle. Visually inspect for significant wear. Actuator replacement
may be required.
Fault in control accessories (if present).
Contact Rotork.
Fault of pipeline valve.
Consult the valve manufacture’s documentation.
Incorrect valve position
Incorrect setting of mechanical stops
(actuator and/or valve).
Check the position of the mechanical stop bolts and readjust.
(see section 9.2).
Incorrect signal from limit switches (if present).
Check limit switch position.
Fault of pipeline valve.
Consult the valve manufacture’s documentation.
Insufficient valve rotation
Insufficient air supply to produce the stroke.
Increase air supply flow.
Incorrect setting of mechanical stops.
Adjust the stop bolts. (see section 9.2).
Debris left in the actuator during maintenance.
Disassemble the actuator to remove debris. Reassemble the actuator.
Fault of pipeline valve.
Consult the valve manufacture’s documentation.
Leakage from actuator vane
Worn seals.
Disassemble the actuator and replace the seals.
Reassemble the actuator. (see section 11.1.2).
Leakage from the setting bolt
Worn seals.
Remove the stop bolt from the actuator and replace the seals.
Reassemble the stop bolt. (see section 11.1.2).
LOSS OF POWER
POSSIBLE CAUSES
CORRECTIVE MEASURES
Inadequate supply pressure.
Ensure that the supply pressure is above the minimum operating
pressure of the actuator and that the output torque produced at supply
pressure exceeds the required valve torque.
Incorrect speed control settings.
Adjust the speed controls to increase flow.
Pipe work blocked, crushed or leaking.
Examine the pipe work for blockages, crushed pipes or leakages.
Clear or replace as necessary.
Fault of control accessories (If present).
Contact Rotork.
High valve torque or incorrect sizing.
Consult the valve manufacturer’s documentation.
For other problems, please contact Rotork.
