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Appendix
1.
Depressurize the actuator completely.
2.
Based on the actuator size, choose the correct threaded rod kit from Table A-1.
3.
Replace one by one each end cap screw for the threaded rod kit and turn down the
adjusting nut until it touches the end cap.
4.
Once all for end cap screws have been replaced, gradually turn the adjustment nuts
on threaded rod in CCW direction by turning the nuts half turn at a time. Make sure
the rod itself does not turn. Continue this until the load of springs are relieved.
5.
Repeat the same procedure for the end cap screws on the other size of the actua-
tor as shown in figure A-1.
6.
In case of an actuator/valve assembly “stuck” in mid position: The actuator now
can be disassembled from Valve, by removing the mounting studs/bolts.
Table A-1.
Threaded rod dimensions in mm
Actuator Size
Thread
Threaded rod length
(mm)
(inch)
12
M4
132
5.2
25
M5
140
5.5
40
M5
140
5.5
65
M5
140
5.5
100
M5
140
5.5
150
M6
145
5.7
200
M6
145
5.7
350
M8
185
7.3
600
M10
185
7.3
950
M12
498
19.6
1600
M12
498
19.6
2500
M12
498
19.6
4000
M14
600
23.6
Figure A-1
Spring load removal rod dimensions
Threaded Rod
Washer
Adjusting nut
Holding nuts
Length
Thread
54
September 2017
Installation, Operation and Maintenance Manual
DOC.IOM.EF.EN Rev. 7
Appendix