Emerson Fisher 3025 Instruction Manual page 16

3025 Actuator
May 2011
2. Place the wiper rings (key 4) into the seal retainers (key 5). Apply lithium grease (key 201) to the O-rings (key 6), the
wiper ring and seal retainer assemblies and install them into the diaphragm casings (key 1). Then insert the cap
screws (key 21) and tighten them.
3. If removed, insert the pins (key 28) into the spring seat (key 29) and diaphragm plate (key 26).
4. Assemble the two travel stop parts (keys 14 and 15), install the lock washers (key 18) and the cap screws (key 18)
and tighten them.
5. Place the diaphragm (key 47) on the diaphragm plate (key 26). Install the ring (key 24) and the cap screws (key 25)
and tighten them.
Note
The size P900 is a double stacked diaphragm casings actuator. First assemble the stack made of a short and a long diaphragm
casing (keys 1 and 3). Then mount the stack composed of two short diaphragm casings (keys 1 and 2).
6. Coat the threads of the stem (key 9) with anti-seize lubricant (key 202).
7. 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). Slide the travel stop assembly (keys 14, 15, 18 and 19), the O-ring (key 6), the
diaphragm plate assembly (keys 24, 25, 26 and 47), the tube if used (key 51), the lock washer (key 50) and the ring
(key 11).
8. Coat the internal thread of the two nut halves (key 10) with anti-seize lubricant (key 202) and tighten them until the
lock washer is completely compressed.
9. Slide the travel stop (key 52) and tighten the set screws (key 57).
10. 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.
11. Install the actuator springs (key 30 and 31). Apply anti-seize lubricant (key 202) into the three cap screw beds of
the spring seat. Coat the disc (key 39) with anti-seize lubricant (key 202). Install the discs into the spring seat and
place the spring seat so that the cap screw beds will be aligned with the internal threads of the diaphragm casing
(key 3).
12. Install the diaphragm casing (key 3) so that the vent and air connection are diametrically opposed. Take care when
lowering the casing around the stem so that the threads do not damage the bushing.
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.
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Instruction Manual
D251402X012