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Installation, Operation and Maintenance Manual
E-90090007 Rev. 0
3.
•
NOTE:
If the problem persists, please continue to the next step below.
4.
Testing and Troubleshooting
CHECK FOR INTERNAL LEAKAGE
With pressure applied to the power stroke side of the operator (end cap side for
style FS operator and cylinder plate side for style SR operator), check for leakage
(blow-by) from breather/vent port of the opposite (spring) side.
—
Check the piston seals if leakage is found on an operator that has not been
used for a long time. Stroke the operator a few times might help the seal
to regain its resiliency and eliminate the problem.
—
If leakage persists, then the seals need to be replaced accordingly.
VALVE LEAKAGE OR UNABLE TO CLOSE COMPLETELY
—
If leakage is through the line valve itself (the valve cannot be closed
completely), check the maximum operator travel (MOT) and maximum
valve travel (MVT). Refer to Section 5.2 and Section 8 if the operator stop
adjustment is required, particularly if the operator was recently installed
or serviced.
Section 9: Testing and Troubleshooting
April 2022
35
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