Patent ID: 7571890

Claim:
In an actuated valve having a casing that carries a rotatable elongate curvilinear cam that has opposing longitudinal ends, said valve carrying spaced apart corresponding stop members in proximity to said cam so that said opposing longitudinal ends of said cam can be rotated into contact with their corresponding stop member, at least one of said stop members being movable toward said cam and then fixed in place, said cam having a surface at each opposing longitudinal end which mates with its corresponding stop member to hold said valve fully open or fully closed, said cam carrying a shaft and disc assembly so that when said cam is rotated said shaft rotates said disc to render said valve either fully open or fully closed, the improvement comprising said cam having at least one notch nearer a at least one longitudinal end and facing said stop member that corresponds with said at least one longitudinal end, said at least one notch having at least first and second sides, said first side extending essentially laterally inwardly into said cam to provide an essentially flat bearing surface to mate with said corresponding stop member when said stop member is positioned toward said cam, said second side extending essentially uprightly inwardly into said cam at an angle from said first side, said angle being sufficient to provide physical spacing of said cam from said corresponding stop member during rotation of said cam so that said cam does not contact said corresponding stop member before said first side comes into contact with said corresponding stop member, and a member carried by said corresponding stop member for fixing said stop member in a position to stop said cam in one of a fully open or fully closed position.