Instruction Manual
D251402X012
3025 Actuator
May 2011
15
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-to-actuator cap screws (key 77), then lift the actuator off the yoke.
8. 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).
9. Unscrew the cap screws (key 35) and remove the flange (key 34) and gasket (key 72).
10. Unbend the ring retaining (key 59) and slide towards the casing. Remove the 2 ring halves (key 61) and then the
ring retaining.
WARNING
To avoid personal injury from the precompressed spring force thrusting the diaphragm casing away from the actuator,
relieve the spring compression (step 11 below) and carefully remove casing cap screws and nuts (keys 45 and 46) (steps 12
and 16 below).
11. Relieve the spring compression by unscrewing alternately and slowly the three cap screws (key 32).
Note
The size P900 is a double stacked diaphragm casings actuator. First disassemble the stack composed of two short diaphragm
casings (keys 1 and 2). Then disassemble the stack made of one short and one long diaphragm casings (keys 1 and 3).
12. Remove all the cap screws and nuts (keys 45 and 46) of the short diaphragm casings assembly (keys 1 and 2). If
required, remove the vent (key 49).
13. Lift off the diaphragm casing (key 1).
14. Unscrew the nut (key 10). Remove the ring retaining (key 11), the washer (key 55), the O-ring (key 20), the
diaphragm (key 48), the diaphragm plate (key 27), the lock washer (key 50), the ring retaining (key 11) and the two
nut halves (key 10).
15. Remove the cap screws, the washers (keys 22 and 23) and the diaphragm casing (key 2).
16. Remove all the cap screws and nuts (keys 45 and 46) of the long diaphragm casings assembly (keys 1 and 3). If
required, remove the vent (key 49).
17. Lift off the diaphragm casing (key 3).
18. Remove the spring seat with the discs (keys 29 and 39) and actuator spring (key 30).
19. Lift off the stem and diaphragm plate assembly.
20. Unscrew the set screw (key 57) and remove the travel stop (key 52). Loosen the nut (key 10). Remove the ring
retaining (key 11), the wave washer (key 50), the tube if used (key 51), the diaphragm plate and diaphragm
assembly (keys 24, 25, 26 and 47), the O-ring (key 6), the travel stop assembly (keys 14, 15, 18 and 19), the
retaining (key 11) and the two nut halves (key 10).
21. Unscrew the cap screws (key 25), disassemble the ring (key 24), the diaphragm (key 47) and the diaphragm plate
(key 26).
22. If required, remove the cap screws (key 18), lock washers (key 19) and disassemble the travel stop (keys 14 and
15).
23. Unscrew the cap screws (key 21), remove the wiper ring and the seal retainer (keys 4 and 5) and the O-ring (key 6).
24. If required, remove the casing bushings (keys 7 and 33), the pins (key 28) from the diaphragm plate and spring
seat. If required, remove the travel scale, the screws and nuts (keys 74, 75 and 76).
Size P900 Actuator Assembly
1. If removed, coat the bushing (keys 7 and 33) with lithium grease (key 201) and slide them into the diaphragm
casings.
