Size P462 Actuator - Emerson Fisher 3025 Instruction Manual

Instruction Manual
D251402X012
13. The first four bolts tightened should be diametrically opposed and 90 degrees apart. Tighten these four bolts to 8
NSm (6 lbfSft).
14. Tighten the remaining bolts in a clockwise, crisscross pattern to 8 NSm (6 lbfSft).
15. Repeat this procedure by tightening four bolts, diametrically opposed and 90 degrees apart, to a torque of 16
NSm (12 lbfSft).
16. Tighten the remaining bolts in a clockwise, crisscross pattern to 16 NSm (12 lbfSft).
17. After the last bolt is tightened to 16 NSm (12 lbfSft) all of the bolts should be tightened again to 16 NSm (12 lbfSft)
in a circular pattern around the bolt circle.
18. Once completed, no more tightening is recommended.
19. Tighten the set screws (key 57) into the nut (16).
20. If used, place the locknut and travel stop on the stem (keys 65 and 66) and screw the locknut against the travel
stop.
21. Place the gasket (71) and the lifting lug cap (40) onto one of the diaphragm casings according to the actuator
action (air-to-close: key 1, air-to-open: key 3). Insert the cap screws (key 44) and tighten them.
22. If removed, place the travel stop (key 41) into the lifting lug cap.
23. If the actuator is equipped with a side-mounted handwheel, it is necessary to adjust the actuator travel stop
before mounting the actuator onto the side-mounted handwheel. Perform the Travel Stop Adjustment in
accordance with the procedures in the Installation section. Then refer to the Side-Mounted Handwheel Assembly
procedures in the Side- Mounted Handwheel Maintenance section to complete the actuator assembly (from step
9).
24. Lift the actuator and place it onto the yoke. Insert the cap screws (key 77) and tighten them.
25. If removed, screw the vent (key 49) into the diaphragm casing (key 3).
26. Mount the actuator onto the valve in accordance with the procedures in the Installation section.

Size P462 Actuator

Size P462 Actuator Disassembly
1. Bypass the control valve. Reduce the loading pressure to atmospheric, and remove the tubing or piping from the
diaphragm casing (key 1).
2. If the actuator is equipped with a side-mounted handwheel, refer to the Side-Mounted Handwheel Disassembly
procedures in the Side-Mounted Handwheel Maintenance section to separate the actuator and handwheel (steps 2
to 7). Then continue the Size P462 Actuator Disassembly procedure from the step 8.
3. For an air-to-open actuator only: slightly pressurize the actuator diaphragm until movement of the actuator stem is
detected. The spring force applied to the stem connector is relieved.
WARNING
To avoid personal injury due to sudden uncontrolled movement of parts, do not loosen yoke locknut or cap screws and do
not remove parts of the stem connector when the stem connector has spring force applied to it.
4. Remove the stem connector cap screws (key 87), the anti-rotator (key 85), the spacer if used (key 86) and the travel
scale indicator (key 84). Loosen the stem connector halves cap screws and nuts (keys 80 and 81). Remove the stem
connector halves.
5. For an air-to-open actuator only: slowly exhaust the diaphragm pressure.
6. To separate the actuator from the valve body, remove the yoke locknut or the bolts and then lift off the actuator.
3025 Actuator
May 2011
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