Instruction Manual

Instruction Manual
D103296X012
2052 Actuator
November 2011
5
desired action. For s uccessful operation, the diaphragm rod assembly, lever, and valve shaft must move freely in
response to changes in the loading pressure on the diaphragm.
Actuator Mounting
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 Uselock-outprocedurestobesurethattheabovemeasures 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.
D Check with your process or safety engineer for any hazards that may be present from exposure to process media.
Use the following steps to mount the actuator or to change actuator mounting style or position.
Unless otherwise specified, key numbers referenced in the following procedures are shown in figure 7 for the 2052
actuator.
If the Actuator is mounted on a valve body and it is necessary to change mounting style or position, the actuator must
first be separated from the valve body.
1. Isolate the valve body from the process. Release process pressure and vent all actuator pressure.
2. Remove the cover or plug (key 2).
WARNING
To avoid personal injury and equipment damage from moving parts, keep fingers and tools clear while stroking the
actuator with the cover removed.
3. Loosen the cap screw (key 15).
4. Separate the actuator from the valve body by removing the cap screws and nuts which secure the valve to the
mounting yoke (key 27). Proceed to step 5.
If the actuator i s not mounted on a valve body ensure the up and down travel stops (see figure 3) are adjusted
correctly to achieve the desired actuator rotation. Use the travel indicator (key 21) and travel scale (key 19) as
reference.
Note
Once each travel stop is properly positioned, adequately tighten the hex nut (key 24) to lock the travel stop in place.