Instruction Manual
D101329X012
1078 Actuator
June 2017
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If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section in this
instruction manual.
The 1078 manual actuator is normally shipped mounted on a power actuator. If the manual actuator has been shipped
separately for installation on a power actuator, or if the manual actuator was removed for maintenance, mount the
manual actuator by following the instructions presented in this section.
Converting An Existing Power Actuator For Use With The Fisher 1078
Manual Actuator
Field conversion of a power actuator for use with the 1078 manual actuator may require replacement and/or removal
of some parts. The procedures which follow apply only to power actuators which were not ordered specifically for use
with the 1078 manual actuator. Proceed as appropriate:
Installing the Manual Actuator
WARNING
Avoid personal injury 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 to avoid personal
injury.
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Disconnect any operating lines providing air pressure, electric power, or a control signal to the power 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
on both sides of the valve. Drain the process media from both sides of the valve.
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Vent the power actuator loading pressure and relieve any actuator spring precompression.
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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, or when
loosening the packing box pipe plug.
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Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
CAUTION
Undertravel or overtravel of the valve ball or disk, especially at the closed position, may result in poor valve performance
and/or damage to the equipment. Make certain that the power actuator travel stops are properly set before installing and
adjusting the manual actuator. Refer to the instruction manuals for the valve and the power actuator for information about
setting travel stops.
1. 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. Also shut off all pressure lines to the power actuator and release all
