F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 31/44 (2006.01) F16H 7/06 (2006.01) F16K 31/54 (2006.01)
Patent
CA 2525741
A rotary valve actuator that effects rotary movement of a rotary valve from 0 to 90°, or to 120°, or to 180°, or even more. The actuator includes a heavy plate member coupled with a linear motive source, which reciprocates the plate member between a first position and a second position. First and second coaxial wheels are fastened together on a single shaft and are rotatably supported tangent to one side of the plate member. A first flexible pull connector, such as a length of roller chain, is attached to the end of the plate member farthest from the linear motive source, and wraps around the first wheel. A second flexible pull connector is attached to the end of the plate member closest to the linear motive source, and wraps around the second wheel, in the opposite direction of winding as for the first flexible connector. When the linear motive source drives the plate member toward a second position, the first flexible pull connector unwraps from around the first wheel, driving the wheel in a first angular direction. When the linear motive force drives the plate member back towards the first position, the second flexible member unwraps from around the second wheel, driving the second wheel in an angular direction, opposite from the first direction. The shaft is rotated when the wheels rotate, and it may be connected to a rotary valve shaft. The actuator may be provided with a tensioning assembly secured to the plate member and cooperating with one of the pull connectors, thereby maintaining a tension force in all the pull connectors.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
Engineered Valves International Inc.
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