Emerson Fisher 3025 Instruction Manual page 8

3025 Actuator
May 2011
16. From the diaphragm casing (key 1) remove the retaining ring (key 8), the wiper ring and the seal retainer (keys 4
and 5) and the O-ring (key 6).
17. If required remove the casing bushings (keys 7 and 33), the pins (key 28) from the diaphragm casing and
diaphragm plate, the hellicoils (key 58), the travel scale, screw and nuts (keys 74, 75 and 76).
Size P460 Actuator Assembly
1. If removed, coat the bushings (keys 7 and 33) with lithium grease (key 201) and slide them into the diaphragm
casings.
2. Place the wiper ring (key 4) into the seal retainer (key 5). Apply lithium grease (key 201) to the O-ring (key 6), the
wiper ring and seal retainer assembly and install them into the diaphragm casing (key 1). Then place the retaining
ring (key 8).
3. If removed, insert the pins (key 28) into the diaphragm casing (key 3) and diaphragm plate (key 26).
4. If removed, insert the hellicoils (key 58) into the nut (key 16).
5. Coat the threads of the stem (key 9) with anti-seize lubricant (key 202).
6. Apply anti-seize lubricant (key 202) to the internal thread of the two nut halves (key 10). Install the nut halves and
the retaining ring (key 11). Place the tab washer (key 13) and bend it on the retaining ring. Slide the travel stop (key
14), the washers if used (key 64), the O-ring (key 6), the diaphragm (key 47), the diaphragm plate (key 26), the tube
(key 51), the wave washers (key 12) and the ring (key 17).
7. Coat the internal thread of the travel stop (key 54) with anti-seize lubricant (key 202), screw it onto the stem and
tighten until the wave washers are completely compressed.
8. Place this stem assembly into the diaphragm casing (key 1). Take care when pushing the actuator stem through the
diaphragm casing so that the threads do not damage the bushing, O-ring or wiper ring.
9. Place the actuator springs (keys 30 and 31).
10. Install the diaphragm casing (key 3) so that the vent and air connections are diametrically opposed. Take care
when lowering the casing around the stem so that the thread do not damage the bushing. Apply lithium grease
(key 201) to the washer (key 53) and place it.
11. Apply anti-seize lubricant (key 202) on the nut internal thread (key 16) and screw it slowly to compress the springs
until the two diaphragm casings touch the diaphragm.
Note
When you replace actuator diaphragms in the field, take care to ensure the diaphragm casing bolts are tightened to the proper
load to prevent leakage, but not crush the material. Perform the following sequence with a manual torque wrench.
CAUTION
Over-tightening the diaphragm cap screws and nuts (keys 45 and 46) can damage the diaphragm. Do not exceed 16 NSm
(12 lbfSft) torque.
Note
Do not use lubricant on these bolts and nuts. Fasteners must be clean and dry.
12. Align the diaphragm casings and diaphragm holes. Be sure the vent and air connections on the diaphragm casings
are still diametrically opposed. Install the cap screws and nuts (keys 45 and 46). Tighten the diaphragm cap screws
and nuts in the following manner.
8
Instruction Manual
D251402X012