Flowserve LPS Pneumatic Heavy-Duty Actuator Series - Manual (Page 25)

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LPS Series Heavy-Duty Actuators FCD LFENIM0001-02-AQ – 5/15
flowserve.com
5
Troubleshooting
To prevent the actuator from not functioning properly or a reduction in performance, first ensure that the installation
and the adjustment operations are carried out completely in accordance with this manual.
a WARNING: When attempting to identify faults, it is very important to observe all the regulations and instructions
about safety. Read all the paragraphs of this manual concerning maintenance before opening for inspection or
starting to repair any actuator components. If in doubt, choose SAFETY FIRST.
The following table lists potential problems along with corresponding causes and possible solutions. If a malfunction
cannot be identified and eliminated using the table, please contact a Flowserve representative.
Troubleshooting Table
Problem
Possible Cause Solution
The actuator does not move.
Actuator has not been properly installed.
Check that all the pneumatic connections and
that all the pneumatic components have been
installed correctly, and are in accordance with
the actuator operating mode.
Check that the actuator is properly connected to
the valve and that there aren’t problems in the
mounting kit.
Supply pressure problems.
Check that sufficient supply pressure is available
at actuator inlet port. If possible, place a gage in
line and monitor the pressure level, in order to
discover unexpected pressure drops.
Problems in the control panel (if present).
Check the correct functioning of the control
panel. In particular, check all the pneumatic and
electric connections.
Check the correct level of supply voltage for
solenoid valves and other electrical/electronic
components.
The valve is blocked.
Check that valve is free to rotate. If necessary,
disassemble the actuator from the valve.
Exhaust port(s) obstructed.
Screw cap(s) must be disengaged. Ensure vent
ports are free. If not, clean them of any obstruc-
tions and clean the dust excluders, if present.
Problems with lubricants.
Ensure that the actuator is properly lubricated,
and that there is no solidified grease among
sliding parts or rotating parts. If actuator
lubrication is inadequate or improper, apply a
uniform lubricant layer. Follow the instructions
for Scotch yoke and cylinder maintenance
(par. 4.3). Consult Flowserve for proper oil and
grease to be used.