Emerson Process Management 3024C - Manual (Page 9)

3024C Actuator
Instruction Manual
Form 5760
March 2007
9
For a Type 3024C Air-to-Close Actuator
(figure 8)
a. Lift off the upper diaphragm casing (key 16)
and casing spacer (key 29) and seal ring (key 30)
if fitted (see figure 14).
b. Using a strap wrench or soft-jawed vice, hold
the actuator stem (key 8) and remove the travel
stop nut (key14).
c. Remove the pressure plate (key 10), O-ring
(key 12), diaphragm (key 11), diaphragm plate
(key 13) and the split ring halves (key 9).
7. Carefully slide the actuator stem (key 8) out of
the bottom of the lower diaphragm casing (key 1)
and set it on a protective surface to prevent damage
to the O-ring sealing surface.
8. Remove the bellows (key 31), if used.
9. Unscrew the cheese head screws (key 7), then
remove the bushing (key 6).
10. With the actuator disassembled, inspect all parts
for excessive wear and replace as necessary.
Assembly
This procedure assumes that the actuator is
completely disassembled. If it is not, start the
instructions at the appropriate step.
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 N
Sm (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 Type 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).