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Instruction Manual
D103407X012
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
D Be aware of pinching parts during installation, maintenance, and adjustments of valve/actuator components. To avoid
injury, keep hands and tools clear of actuator access windows when operating or adjusting the actuator.
CAUTION
To avoid parts damage, do not stroke the actuator while cover (key 33) is off.
Disassembly
The following procedure describes how to completely disassemble the actuator. When inspecting and replacing parts,
perform only those steps necessary to accomplish the repair.
Do not, under ordinary circumstances, remove the cap screws (keys 7 and 8) at this time.
CAUTION
Cap screw (key 18) must be disengaged from the lever (key 27) before removing the diaphragm casing (key 1). Failure to do
so will allow the spring precompression to rotate the valve beyond its fully open or closed position. This could cause
damage to the valve components and/or seal.
1. Perform the steps in the WARNING at the beginning of the Maintenance section to isolate the control valve and
actuator.
2. Remove the tubing or piping from the top of the actuator.
3. Remove the positioner, if used. If necessary, refer to the positioner instruction manual for removal instructions.
4. Unscrew the cap screws (key 34), and remove the washers (key 31), cover (key 33), and any accessories attached to
this end of the actuator.
5. Remove the travel indicator (key 37) from the hub (key 29). Slide the hub (key 29) from the cover.
6. Inspect, and if necessary, replace the cover bushing (key 31). Remove the travel indicator scale (key 35) by
removing the self‐tapping screws (key 36). Press the bushing out of the cover (key 33).
7. Remove the cap screw and hex nut (keys 18 and 19).
8. Make note of the lever/valve shaft orientation, and then loosen the cap screw (key 28).
1052PSV Actuator
May 2011
15
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