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Fisher® 1078 manual actuator
Fisher® manual handwheel actuators are used in applications that require a throttling type of control valve that can be manually operated and set. Capable of giving precise manual throttling control, these actuators can be used on nearly all standard globe-style or angle-style valve body assemblies. A travel indicator on the actuator yoke can provide a visual indication of valve plug position.
Fisher® 1078 manual actuators are declutchable actuators for manual operation of control valves and equipment that use power actuators. The 1078 manual actuator mounts directly to Fisher 1051 sizes 33, 40, and 60; 1052 sizes 33, 40, 60, and 70; 1061 sizes 30, 40, 60, 68, 80, and 100; and to all sizes of 1066 and 1066SR actuators.
For 1051 size 33, 1052 size 33, 1066, and 1066SR actuators, coupling to the power actuator is via a flatted shaft installed in the lever or hub. The dimensions of these shafts are the same as those used with H mounting adaptations. The stub shaft fits into a square broach in the manual actuator sector, and spacers secure the shaft in the appropriate position.
- Direct Attachment to the Power Actuator—Direct mounting to the actuator housing simplifies installation and eliminates the need for yokes and other brackets.
- 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. Because the travel indicator components are mounted on a through shaft, accurate travel indication is maintained during manual actuator disengagement or engagement.
- Positive Operation—The disengagement lever is locked in both the engaged and disengaged positions by a detent mechanism, which must be released before the lever can be moved. This provision reduces the possibility of inadvertent or accidental operation. In addition, stop-pins at the fully engaged and fully disengaged positions provide positive limits for lever travel. (Note that stop pins are not available on 1078 size II-FA actuators.)
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