Changing Actuator Mounting; Changing Styles - Emerson Fisher 1052 Instruction Manual

Instruction Manual
D100323X012
10. Attach the output shaft (key 87) to the mounting plate (key 22) with the retaining ring (key 88). Then, with the
actuator at the top of its stroke, attach the mounting plate and output shaft assembly to the actuator housing
(key 20) with the cap screws (key 23) so that the markings that were made in step 5 of the Disassembly procedure
are oriented correctly (output shaft to actuator housing and travel indicator to travel indicator scale).
11. For newer clamping levers, torque the cap screw and nut (keys 28 and 145) on the output shaft (key 87). See
table 2 for torque values.
12. Adjust the initial spring compression as described in the spring compression adjustment procedure of the
Installation section. Remember to replace the cover and cap screws (keys 39 and 40) after performing this
procedure.
13. With the initial spring compression adjusted, slide the actuator onto the equipment operating shaft and secure it
to the mounting bracket in the desired mounting position with with mounting cap screws (key 78). Tighten the cap
screws to the value in table 2.

Changing Actuator Mounting

The actuator is normally positioned vertically in a horizontal pipeline. However, each style can be mounted in two
possible housing construction styles and four possible positions. See figure 5.
WARNING
Avoid personal injury from sudden release of process pressure or uncontrolled movement of parts. Before performing any
maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the power actuator. Be sure
the actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Use the following procedures along with figure 6 for key number references to convert from style A to style B or vice
versa or to change the mounting position.

Changing Styles

1. Perform steps 1 through 4 of the Disassembly portion of the Maintenance section.
2. Remove the self‐tapping screws or cap screws (key 36), and then remove the hub with attached travel indicator
(keys 29 and 37) and the travel indicator scale (key 35).
3. Unscrew the cap screws (key 78) and remove the actuator assembly from its mounting bracket.
4. Unscrew the cap screws (key 23) and remove the mounting plate (key 22) and output shaft (key 87) assembly from
the actuator housing.
1052 Size 20 Actuator (H)
June 2017
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