Patent ID: 8528592

Claim:
A check valve construction which comprises: a movable ball having a convex surface, a cage having a conical frustum chamber for said ball, a seat for said ball, a fluid path between said ball and said cage defined by the equation: G = D ⁢ ⁢ cos ⁡ ( b - a ) 2 ⁢ ⁢ cos ⁢ ⁢ b - d 2 wherein G is the gap of the narrowest passageway of the fluid path, D is the diameter of the small end of the conical frustum chamber of the said cage, d is the diameter of the convex surface of said ball, a is the angle between a vertical diameter of said ball and the position of the narrowest gap on the convex surface of said ball, and b is the angle between the vertical diameter of the movable ball and the position of the small end of conical frustum chamber of said cage.