24
Installation, Commissioning and Maintenance Manual
15.0 Troubleshooting
ID
FAILURE
POSSIBLE CAUSES
CORRECTIVE MEASURES
1
Incorrect valve position
• Fault of pipeline valve
• Consult the valve manufacture’s documentation
2
Incorrect indication of valve position • Incorrect signal from limit switches
• Check limit switches position (see job specific
documentation)
3
Incorrect movement
• Irregular supply of operating medium
• Verify the supply pressure and adjust as
necessary
• Worn parts
• Contact Rotork
• Fault in control panel equipment
(if present)
• Contact Rotork
• Fault of pipeline valve
• Consult the valve manufacture’s documentation
4
Valve stroke not fully completed
• Insufficient gas flow
• Increase gas supply flow
• Incorrect assembly between actuator
and valve
• Perform assembly according to section 10.0
• Valve blocked
• Consult the valve manufacture’s documentation
• Stop bolts wrong setting
• Adjust stop bolt setting following instructions in
section 12.7
5
Leakages
• Stop bolts wrong setting
• Adjust stop bolt setting following instructions in
section 12.7
• Worn seals
• Replace seals according to instructions reported
in
PM-LP-006, PM-LP-007
6
Actuator moves too fast
• No pressure on pipeline
• Restore pipeline pressure
• Supply pressure greater than allowed
range values
• Verify the supply pressure and adjust as
necessary
7
Actuator moves too slow
• Fault on pipeline valve (valve hardened)
• Consult the valve manufacture’s documentation
• Supply pressure lower than allowed
range values
• Verify the supply pressure and adjust as
necessary
• Possible internal undue friction
• Contact Rotork
8
Loss of power
• 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
• Leakage from cylinder
• Replace seals according to instructions reported
in
PM-LP-006, PM-LP-007
For other problems, please contact Rotork.
A4
US
US
A4
US
A4
US
A4
Summary of Contents for LP/S Series
Page 89: ...Keeping the World Flowing 89...
