Emerson Fisher 3024C Instruction Manual - Page 10

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3024C Actuator

June 2023

1. Before starting assembly, apply lithium grease (key 200) to the O‐ring in the bushing (key 6 and key 12). Install the

new bushing (key 6) and assemble with the cheese head screws (key 7) onto the lower diaphragm casing (key 1).

Use a torque of 0.4 NSm (3 lbfSin).

2. Assemble the ring halves (key 9), pressure plate (key 10), O‐ring (key 12), diaphragm (key 11) and diaphragm plate

(key 13) on to the actuator stem as shown in figure 9 for Air‐to‐Open or figure 8 for Air‐to‐Close.

3. Apply thread locking adhesive (high strength) (key 201) to the thread on the upper end of the actuator stem, fit the

travel stop nut (key 14) but do not tighten. Then perform one of the following procedures as appropriate.

For a 3024C Air‐to‐Open Actuator (figure 9)

a. Carefully slide the actuator stem (key 8) (with the assembled parts) down through the bushing (key 6).

b. Position the actuator springs (key 15) symmetrically on the diaphragm plate (key 13) as shown in figure 5.

c. Install the upper diaphragm casing (key 16) so that the springs fit correctly over the seat bosses of the spring

locator (key 17). Rotate the upper diaphragm casing along with the diaphragm/diaphragm plate assembly so

that the air connection in the upper diaphragm casing is located directly above the air connection in the lower

diaphragm casing. Then rotate the diaphragm without moving either the upper diaphragm casing or the

diaphragm plate so that the diaphragm holes line up with those in the casings.

d. Lift off the upper diaphragm casing and remove the springs. Tighten the travel stop nut (key 14 as follows: Sizes

30, 30E, 34, and 34E, tighten to 36 NSm (27 lbfSft); Sizes 40, 40E, 45, and 45E, tighten to 87 NSm 64 lbfSft).

e. Replace the spring as previously.

f. For actuator sizes 40E and 45E with 1.5 and 2 inch travels, a casing spacer is fitted between the upper and lower

diaphragm casings. Place the casing spacer (key 29) on the diaphragm and then the gasket (key 30) as shown in

figure 13.

For a 3024C Air‐to‐Close Actuator (figure 8)

a. Position the actuator springs symmetrically on the spring locator (key 17) as shown in figure 5.

b. For actuator sizes 40E and 45E with 1.5 and 2 inch travels, a casing spacer (key 29) is fitted between the upper

and lower diaphragm casings. Place the gasket (key 30) on the lower casing and then the casing spacer (key 29)

as shown in figure 13.

c. Carefully slide the actuator stem with the assembled parts down through the bushing and position it so that the

springs fit correctly over the seat bosses on the upper side of the diaphragm plate (key 13). Rotate the

diaphragm (key 11) without moving the diaphragm plate (key 13) so that the diaphragm holes line with the

lower diaphragm casing holes.

d. Tighten the travel stop nut (key 14) as follows: Sizes 30, 30E, 34 and 34E tighten to 36 NSm (27 lbfSft); Sizes 40,

40E, 45 and 45E tighten to 87 NSm (64 lbfSft).

4. Install the upper diaphragm casing (key 16) so that the air connection is located directly above the air connection in

the lower diaphragm casing (key 1). Using the long cap screws (key 21) and hex nuts (key 20) first, and then the

shorter cap‐screws (key 19) and hex nuts (key 20), bolt the two diaphragm casings together. Fit the safety plastic

hose (key 22) over the exposed thread of the long cap‐screws (key 21).

NOTICE

Over tightening the diaphragm cap screws and nuts can damage the diaphragm. Do not exceed the torque of 13 NSm (10

lbfSft) for sizes 30, 30E, 34 and 34E and 17 NSm ( 12 lbfSft) for sizes 40, 40E, 45, and 45E.

Instruction Manual

D103048X012