Emerson Fisher 3024C Manuel d'instruction - Page 8

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3024C Actuator

June 2023

k. If the valve travel is not correct repeat the stem connector procedure. Apply approximately 0.5 bar pressure

above the upper setting of the spring range to the bottom of the diaphragm, remove the stem connector and

then repeat steps d to j.

Note

When disassembling the stem connector on Air‐to‐Open constructions it is essential to apply enough air pressure to the underside

of the diaphragm to lift the valve plug off its seat. This will ensure that all residual spring compression in the actuator is supported

while the stem connector is removed.

Actuator Maintenance

Actuator parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of

inspection and replacement depends upon the severity of the service conditions.

This section describes how the actuator can be completely disassembled and assembled. When inspection or repairs

are required, disassemble only those parts necessary to accomplish the job; then start to assemble at the appropriate

step.

Key numbers refer to figures 8 and 9.

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 to avoid personal

injury.

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 Vent the power actuator loading pressure and relieve any actuator spring precompression.

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.

Disassembly

1. For complete disassembly, the positioner and all accessories (if attached) must be removed from the actuator.

Follow appropriate removal procedures in the instruction manuals supplied with the positioner and accessories.

Instruction Manual

D103048X012