Patent ID: 8689824
Filing Date: 2014-04-08
Classification: F16K,Y10T

Abstract:
1. A check valve construction which comprises: a movable disc having a convex surface and a planar, circular base, a flat surface forming said base, and a raised element on said convex surface, a spring comprising an aperture sized to fit the spring over said raised element and to contact said convex surface at the base of said raised element; a cage for said disc, said cage comprising: a first seat for the flat surface of said disc and forming a fluid inlet, a second seat for said spring and forming a fluid outlet, and an annular surface connecting the first seat to the second seat; and defining a fluid path between said disc and said annular surface of the cage; wherein said spring is effective to orient the disc within the cage and to bias the disc toward the flat surface; and to allow the disc to move away from the first seat in response to a pressure differential thereby creating a gap between the first seat and the flat surface and creating a fluid path from said fluid inlet, around the disc and to said fluid outlet; including a narrowest portion of the fluid path defined by the equation: Wherein G: the gap of most narrow passageway between the flat surface of the disc and disc seat; μ: dynamic viscosity of the fluid; D: mean diameter of the flat sealing surface of the disc; Q: desired fluid flow rate; W: breadth of the flat sealing surface of the disc; ΔP: pressure differential across the gap (G).