Instruction Manual
D103296X012
2052 Actuator
June 2017
5
The actuator, as it comes from the factory, is normally mounted on a valve body. If the actuator is shipped separately
or if it is necessary to mount the actuator on the valve, perform the procedures presented in the Actuator Mounting
section. Follow the procedures given in the valve instruction manual when installing the control valve in the pipeline.
If a positioner is ordered with the actuator, the pressure connection to the actuator is normally made at the factory. If
it is necessary to make this connection, run tubing of the appropriate size for the diaphragm casing pressure
connection (reference table 5) between the pressure connection and the instrument. Keep the length of tubing or
pipe as short as possible to avoid transmission lag in the control signal.
When the control valve is completely installed and connected to the controlling instrument, check to make sure that
the action is correct (air‐to‐open or air‐to‐close) and that the controlling instrument is properly configured for the
desired action. For successful 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:
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Do not remove the actuator from the valve while the valve is still pressurized.
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Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
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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.
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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.
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Safely vent the power actuator loading pressure.
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Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
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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.
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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.
