Replacing Diaphragm - Emerson Fisher 2052 Instruction Manual

2052 Actuator
June 2017
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the 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 Safely vent the power actuator loading pressure.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Check with your process or safety engineer for any hazards that may be present from exposure to process media.

Replacing Diaphragm

Isolate the valve body from the process. Release process pressure and vent all actuator pressure.
Disassembly
1. Remove the supply tubing or pipe from the top casing assembly (key 5).
WARNING
To avoid personal injury from precompressed spring force suddenly thrusting parts away from the actuator, spring
compression must first be relieved. Closely follow the instructions below.
Figure 4. Orientation of the Fisher 2052 Actuator Lever into the Housing and Aligning the Actuator to the Valve Shaft
Markings
2. Loosen, but do not remove, all casing cap screws and hex nuts (keys 8 and 9). Ensure there is no spring force to the
top casing assembly (key 5). If spring force is detected against the top casing assembly, ensure the up travel stop
cap screw (key 23) is adjusted correctly to prevent over-rotation of the lever (key 14). Refer to figure 3. The travel
indicator screws (key 22) in the end of the lever should be in alignment with the travel scale screws (key 20). If the
up travel stop is confirmed to be adjusted correctly and force is still detected against the top casing assembly,
contact your local Emerson Automation Solutions Instrument and Valves Service Center. Alternatively, replace two
oppositely located casing cap screws (key 8) with 100 mm (4 inch) long fully threaded M10 cap screws of ISO 898-1
8
UP TRAVEL STOP
Instruction Manual
D103296X012