Emerson Fisher 2052 Instruction Manual page 10

2052 Actuator
June 2017
7. The guide assembly (key 48) may be removed for inspection (size 3 only).
Note
At this stage of disassembly, it may be determined that further disassembly is not necessary. If separation of the diaphragm rod
assembly from the lever is not warranted, proceed to the Assembly portion within this section of the procedure.
8. To gain access to the cap screw (key 16) which secures the diaphragm rod assembly to the lever, the end plate
assembly (key 3) must be removed. Before the end plate assembly can be removed, one of the following
procedures must be performed. Proceed as appropriate:
D For actuators with valve bodies mounted on the end plate assembly (key 3) side of the actuator, the actuator must
be separated from the valve body. Perform steps 1 through 4 of the Actuator Mounting section, remove the
mounting yoke (key 27), and then return to step 9 of this section.
D For actuators with valve bodies mounted on the actuator housing boss side of the actuator [opposite of the
endplate (key 3)], remove the travel indicator pointer (key 21). Proceed to step 9.
9. Remove the socket head cap screws (key 4) and the end plate assembly (key 3).
10. Remove the cap screw (key 16) and nut (key 17) if applicable (size 3 only), that secures the actuator lever (key 14)
to the diaphragm rod assembly (key 10). Remove the diaphragm rod assembly.
11. Inspect all parts and replace if necessary.
12. If total disassembly of the actuator is required, or if the actuator will be assembled for use with a valve body with a
different valve shaft diameter, proceed to the Changing or Replacing Actuator Lever procedure.
Assembly
1. Fasten the diaphragm rod assembly (key 10) to the lever using the cap screw (key 16) and nut (key 17) if applicable.
Tighten per table 6.
2. Install the housing end plate (key 3).
3. Adjust the travel stop bolts to the correct position so that the travel indicator screws (key 22) align with the travel
scale screws (key 20). See figure 3.
4. Install the guide assembly (key 48 - size 3 only).
5. Install the spring(s). The outer (larger diameter) spring is standard for the single spring size 1 & 2 constructions. The
inner spring is standard for the single spring size 3 construction.
6. Place the diaphragm plate (key 6) onto the spring(s). It is important that the springs be properly seated in their
respective counterbores on the bottom side of the plate. If necessary, push or pull the diaphragm plate toward
center to ensure the springs are engaged into their respective seats.
7. Lubricate the socket head capscrew (key 7) and tighten per table 6.
8. Place the diaphragm (key 11) on the diaphragm plate (key 6), making certain that it is properly centered.
9. Observe the correct position of the loading connection fitting and install the top casing assembly (key 5). Replace
the cap screws and nuts (keys 8 and 9) which secure the top casing assembly to the actuator housing. Tighten the
nuts in an alternating fashion (see table 6).
10. Install the inlet piping to the top casing assembly.
11. Install the travel indicator (key 19) if removed.
12. If the actuator was removed from the valve body, refer to the appropriate section in the Actuator Mounting
procedure and proceed as applicable.
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Instruction Manual
D103296X012