Fisher® 10790 pages

December 1993
Bulletin 22.2:1079
Type 1079 Declutchable Manual Actuator
The Type 1079 manual actuator is a declutchable actuator for manual operation of keyed or square shaft
control valves and equipment that use a Type 1032
power actuator. As shown in figure 1, the Type 1079
manual actuator mounts directly on the Type 1032
actuator and can be engaged to allow manual operation of the valve when the power actuator is not in use
or disengaged to allow automatic operation of the
valve by the power actuator.
Features
D Direct Attachment to the Power Actuator—
Direct mounting to the actuator housing simplifies
installation and eliminates the need for yokes and other brackets.
D Engage Manual Actuator At Any Point of
Rotation—A lever-operated eccentric bearing support
on the input shaft allows engagement of the worm
gear with the sector at any point of rotation.
D Positive Operation—The disengagement lever
is held in both the engaged and disengaged positions
by a spring-loaded pin, which must be released before
the lever can be moved. This reduces the possibility of
inadvertent or accidental operation. In addition, stoppins at the fully engaged and fully disengaged positions provide positive limits for lever travel.
W6151/IL
D500209X012
Figure 1. Type 1079 Manual Actuator Mounted on a Type 1032 Actuator and Model B21A Valve