April 2022
Installation, Operation and Maintenance Manual
E-90090007 Rev. 0
32
Section 8: Operator End Stop Adjustment
Operator End Stop Adjustment
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.
Install operator on the valve and adjust the stem nut as directed in Section 6.
2.
Release pressure slowly through end cap (8) ports to fully retract the drive rod (1)
until the operator stops.
3.
Remove the end stop cover (33) and end stop cover seal (57) to access the end
stop (32).
!
CAUTION
Pressurized fluid may escape between the threads in the end stop (32) and the end cap (8)
once the cover is removed.
4.
The end stop (32) will be tightened or jammed against the drive rod (1).
5.
Apply pressure through the end cap (8) ports to move the piston (11) away from
the end stop (32).
!
CAUTION
Air might leak through near the end stop (32) threads.
Move the piston (11) away from the end stop (32) as far as possible to allow sufficient time to
adjust the end stop (32).
6.
When the end stop (32) is free, remove it from the end cap (8) two to four turns.
!
CAUTION
Pressurized fluid might leak through near the end stop (32) threads.
Move the piston (11) away from the end stop (32) as far as possible to allow sufficient time to
adjust the end stop (32).
7.
Release pressure slowly through end cap (8) ports to fully retract the drive rod (1)
until the operator stops.
8.
Screw the end stop (32) into the end cap (8) until it stops by contacting the drive
rod (1).
9.
Reapply pressure through the end cap (8) ports to move the piston (11) away from
the end stop (enough to allow one full turn of the end stop).
10.
Repeat steps 7 to 10 of
Condition A
on previous page to complete the adjustment.
NOTE:
The fully retracted end of the operator travel has now been set.
