Appendix
Appendix A: Spring load removal
This section explains:
•
How to remove the spring load safely of spring-return actuators in case:
—
The valve gets “stuck” in mid position.
—
One of the spring cartridges is broken.
WARNING - MOVING PARTS
A spring-return actuator mounted on a valve, which is stuck in mid stroke, contains a high
spring load which will cause a sudden rotation of the actuator versus the valve during
disassembly. This can cause serious injury to personnel or damage to material.
On spring-return actuators with a broken spring cartridge, the end cap can be “shot” away
during disassembly of the actuator. This can cause serious injury to personnel or damage to
material.
A.1
Spring load relief
CAUTION - ROTATING ACTUATOR
In case of an actuator/valve assembly “stuck” in mid position, leave the actuator on the
valve and/or mounting bracket during this procedure.
Figure A-1
Spring load removal
Crush / Amputaion Hazard
Failure to follow instructions
for removal of spring loaded
actuator may result in
surious personal injury
WARNING
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
actuator 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.
Installation, Operation and Maintenance Manual
DOC.IOM.EF.EN Rev. 6
September 2015
43
Appendix
Summary of Contents for EL-O-Matic F-Series
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