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Appendix A: Spring load removal
This section explains:
•
How to remove the spring load safely of spring-return actuators in case:
Ͷ
The valve gets “stuck” in mid position.
Ͷ
One of the cartridge spring is broken.
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 cartridge spring, the end cap can be “shot” away
during disassembly of the actuator. This can cause serious injury to personnel or damage
to material.
͘ϭ
Spring load relief
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
ϭ͘
Depressurize the actuator completely.
Ϯ͘
Based on the actuator size, choose the correct sized allen key to unmount end-cap.
ϯ͘
Gradually turn end-cap screws. Continue this until the load of springs are relieved.
ϰ͘
Once all four end cap screws have been removed, check cartridge springs. If
necessary choose the correct cartridge spring for replacement.
ϱ͘
Repeat the same procedure for the end cap screws on the other size of
the actuator as shown in figure A-1.
ϲ͘
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.
:$51,1*
