Slow closing actuator and valve

Details Slow closing actuator and valve Slow closing actuator and valve

2008-07-29

2008-07-29

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Rotary valves

Butterfly

C251S286000, C251S288000, C251S304000

Reexamination Certificate

active

07404543

ABSTRACT:
A valve actuator is disclosed for use with short throw valves. The actuator includes a plate perpendicular to the valve stem that has a slot formed of regions having different radii of curvature centered on the valve stem. An eccentric cam is attached to a handle mounted on the valve stem. The cam extends through the slot and is rotatable for positioning at a radius corresponding to the radius of the different slot regions. When the cam is rotated so that it may traverse a slot region, the handle can be turned to move the valve closing member through an angle subtended by the slot region. This permits the valve to be opened or closed in a step-wise fashion and prevents rapid opening and closing of the valve that can cause a water hammer effect.

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