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Section 8: Operator End Stop Adjustment
April 2022
Condition B: MOT is less than MVT by more than 1 full pitch of valve stem thread, which
means potential leakage due to under travel of valve.
NOTE:
In Condition B, the operator travel needs to be increased to maximize valve travel.
1.
2.
3.
4.
5.
6.
7.
8.
NOTE:
The fully retracted end of the operator travel has now been set.
8.2
FS - End Stop Adjustment Conditions
The operator needs to be pressurized to remove the spring load against the end stop (32)
during the adjustment of FS style operator (ensure end stop cover (33) is intact during the
pressurization). The pressure will reduce the force applied to the end stop by compressing
the spring, thus allowing the end stop (32) to be adjusted.
CAUTION
!
Do not remove the end stop (32) completely. Pressurized fluid may escape between the
threads in the end stop (32) and the end cap (8) once the cover is removed, while the cylinder
is pressurized.
30
Install operator on valve and adjust the stem nut as directed in Section 6.
(Installation).
Make sure to release the pressure through cylinder plate ports if the operator is
pressurized to allow piston to move away from end stop (32).
Remove the end stop cover (33) and end stop cover seal (57) to access the end
stop (32).
When the end stop is free, unscrew it from the end cap (8) two to four turns.
Reapply pressure slowly through cylinder plate ports to fully retract the drive rod
until the operator stops.
Screw the end stop (32) into the end cap (8) until it stops by contacting the drive
rod (1).
Release pressure through cylinder plate ports to allow piston to move away from
end stop (enough to allow one full turn of the end stop).
Repeat steps 7 to 10 of Condition A on previous page to complete the adjustment.
Installation, Operation and Maintenance Manual
E-90090007 Rev. 0
Operator End Stop Adjustment
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