Instruction Manual
D103296X012
2052 Actuator
June 2017
13
Disassembly
WARNING
To avoid personal injury from the precompressed spring force thrusting the upper diaphragm casing away from the
actuator, fully turn the handwheel counterclockwise.
1. Perform steps 1 through 6 of the Replacing Diaphragm procedure.
2. Remove the cotter pin, hex nut, handwheel, and locknut (keys 34, 33, 32, and 43). Unscrew the stem (key 35) out
through the actuator end of the handwheel body (key 5).
3. Check the condition of the O‐ring (key 44); replace if necessary.
4. If it is necessary to remove the pusher plate or spacer (key 36 or 42), drive out the groove pin (key 37).
Assembly
1. Before assembling, lubricate the thread of the stem (key 35) with anti‐seize lubricant. Lubricate the bearing
surfaces of the stem and rounded end with lithium grease.
2. If the pusher plate or spacer was removed, attach them to the stem and drive in a new groove pin (key 37).
3. With the O‐ring (key 44) in place, thread the stem into the handwheel assembly.
4. Install the locknut, handwheel, hex nut, and cotter pin (keys 43, 32, 33, and 34).
Note
Be sure to install the handwheel so that the arrow of operation on the top side coincides with the action of the actuator, as stated
on the nameplate. (The arrow should point clockwise for PDTO. The arrow should point counter-clockwise for PDTC.)
5. Install the top casing assembly, making certain the warning tag is in place on the casing flange.
Locking Mechanism
Refer to figures 5 or 6 for the appropriate size locking mechanism when installing or planning to operate the device.
WARNING
Avoid personal injury or property damage from sudden release of process pressure or bursting 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.
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
Check with your process or safety engineer for any hazards that may be present from exposure to process media.
