Instruction Manual
D101329X012
1078 Actuator
June 2017
9
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Excessive pressure drop across the valve body, or
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Obstruction to the valve disk or ball rotation.
If the manual actuator does not seem to control the process fluid, the worm or drive sleeve gear teeth may be broken,
the pin (key 3) may be sheared, or the internal power actuator or valve parts may be broken. Purchase a replacement
manual actuator if necessary. Refer to the power actuator and valve instruction manuals if power actuator or valve
maintenance is needed.
Lubrication
The interior parts of the 1078 manual actuator should be lubricated on a regular schedule with a quality gear lubricant.
The interior parts should also be lubricated whenever difficulty in handwheel rotation indicates a need for lubrication.
WARNING
Avoid personal injury from sudden release of process pressure or uncontrolled movement 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
from 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.
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. If using a power actuator, also shut off all pressure lines to the power
actuator, 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.
2. Mark the position of the travel indicator pointer on the indicator dial. The travel indicator pointer must be returned
to its original position when assembling the manual actuator. Remove the machine screws and the travel indicator
pointer.
3. Remove the manual actuator cover screws.
4. Remove the travel indicator scale and the gearbox cover plate. Coat the worm, the drive sleeve gear teeth, and the
bearing surfaces of the gearbox housing and worm with a quality gear lubricant.
5. Install the cover plate and the travel indicator scale on the gearbox.
6. Replace the manual actuator cover screws.
