Maintenance (Sizes 60-130) - Emerson Fisher 585C Series Instruction Manual

585C Actuator
October 2013

Maintenance (Sizes 60-130)

WARNING
To avoid personal injury or property damage caused by cylinder fracture as a result of piston impact, install the stem
connector securely before supplying pressure to the positioner. Use only a regulator-controlled air supply to move the
actuator piston so that you can install the stem connector. Do not use the positioner to move the actuator piston before
installing the stem connector.
WARNING
Avoid personal injury from sudden release of process pressure or uncontrolled process fluid. Before starting disassembly:
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 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
on both sides of the valve. Drain the process media from both sides of the valve.
D 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 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.
Key numbers indicated refer to figures 9 through 12.
Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. Shut-off all pressure lines and power to the actuator, and release all
pressure from the actuator. Use lock-out procedures to be sure that the above measures stay in effect while you work
on the equipment.
1. If positioner is not used, go to step 5. If positioner is used, shut off all pressure lines to the positioner then remove
all tubing lines (cylinder, instrument and supply) from the positioner.
CAUTION
Do not use wrenches or other tools directly on the valve stem. Damage to the stem surface could result in subsequent
damage to the valve packing.
2. Remove the stem connector (key 12) and the piston rod boot (key 29) used to protect the lower end of the actuator
stem.
3. Remove the socket head cap screws that hold the cylinder (key 1) to the yoke (key 6).
CAUTION
Exercise care in the following step to prevent damage to the cylinder wall during removal of the cylinder from the yoke.
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Instruction Manual
D102087X012