Patent ID: 7762526

Claim:
A valve assembly, comprising: a valve, comprising: a housing defined by a pair of coaxial openings in said housing, said openings in spaced relation separated by a distance defined as a flange spacing; a valve plate located in said housing, said valve plate defining a first open position, a second eclipsing position and a third sealed position; and a plate actuator assembly, comprising: a concentric shaft assembly comprising a center shaft within a sleeve shaft, said sleeve shaft comprising a cam groove cut therein, said center shaft attached to said valve plate, said concentric shaft assembly defining three positions, a first open position corresponding to said valve plate first open position, wherein said valve plate is not coaxial with said openings, a second open position corresponding to said valve plate second open position, wherein said valve plate is coaxial with said openings, and a third closed position corresponding to said valve plate third closed position, with said center shaft defined by a follower roller extending therefrom to engage said cam groove; and motor means for selectively driving said concentric shaft assembly to each of said three positions by applying separate rotational forces to said sleeve shaft and said center shaft.