F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
F16K 31/52 (2006.01) F16H 21/12 (2006.01) F16K 31/16 (2006.01) F16K 31/163 (2006.01)
Patent
CA 2280411
Apparatus primarily for use in seating and unseating a valve by turning the valve stem between a fully opened and fully closed position. In one form of the invention, a lever arm attached to the valve stem is connected at one corner of a triangular shaped crank arm by a link. A second corner of the crank arm is rotatably mounted on a fixed shaft and the third corner is connected to an actuator. The shaft, the link and a pivot point on the distal end of the lever arm and are all brought into alignment along a common axis when the valve is in a fully closed position. Moving the actuator in the opposite direction breaks the alignment between the link and the crank arm and pulls the lever arm toward a valve opening position.
Blake Cassels & Graydon Llp
Young & Franklin Inc.
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