Size P460-200 Actuator - Emerson Fisher 3025 Instruction Manual

3025 Actuator
May 2011
procedures in the Side- Mounted Handwheel Maintenance section to complete the actuator assembly (from step
9).
25. Lift the actuator and place it onto the yoke. Insert the cap screws (key 77) and tighten them.
26. If removed, screw the vent (key 49) into the diaphragm casing (key 3).
27. Mount the actuator onto the valve in accordance with the procedures in the Installation section.

Size P460-200 Actuator

Size P460-200 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 P460-200 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 the 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.
7. Remove the yoke cap screws (key 77), then lift the actuator off the yoke.
8. Remove the bellows (key 68). Remove the lifting lug cap screws (key 44), the lifting lug (key 40) and the gasket (key
71). If required, loosen the locknut (key 42) and remove the travel stop (key 41).
WARNING
To avoid personal injury from the precompressed spring force thrusting the diaphragm casing away from the actuator,
carefully remove casing cap screws and nuts (keys 45 and 46) (step 9 below) and then relieve the spring compression by
unscrewing the nut (key 16) (step 11 below).
9. Remove all the diaphragm casing cap screws and nuts (keys 45 and 46). If required remove the vent (key 49).
10. Unscrew the locknut (key 62).
11. Relieve the spring compression by unscrewing slowly the nut (key 16).
12. Remove the washer (key 53), then lift off the diaphragm casing (key 3).
13. Remove the actuator springs (keys 30 and 31).
14. Lift off the stem and diaphragm plate assembly.
15. Unscrew the travel stop (key 54), remove the wave washers (key 12), the tube (key 51), the O-ring (key 6), the
diaphragm and diaphragm plate assembly (keys 24, 25, 26 and 47). Remove the retaining ring (key 11) and the two
nut halves (key 10).
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Instruction Manual
D251402X012