Patent ID: 7287545
Filing Date: 2007-10-30
Classification: F16K,Y10T

Abstract:
1. A check valve device for mounting in process piping systems which allows fluid flow in an upstream-to-downstream direction and prevents fluid flow in the opposite downstream-to-upstream direction, the valve device comprising: a rigid plate including an outer circumferential edge, an upstream face, a downstream face, and a port through said plate extended between said faces; and a body including a gasket, a plug, and a retaining means flexibly interconnecting between said gasket and said plug, said gasket being adapted to seal between a pair of mating pipe flanges consisting of an upstream flange and a downstream flange, said plug being adapted to seal said port when retained against said downstream face of said rigid plate, said retaining means guiding the movement of said plug outwardly from and inwardly towards said downstream face of said rigid plate, said retaining means further being adapted to retain said plug against said downstream face of said rigid plate to seal said port, said retaining means creating a plurality of flow paths through which fluid passes around said plug when said plug is pushed away from said downstream face by fluid flowing in the upstream-to-downstream direction; wherein an edge of at least one said flow path is coincident with and immediately adjacent to the inside wall of the piping system; wherein said port is of ovalized shape having a minor axis smaller than, and a major axis equal to, the inside diameter of the pipe into which said valve device is installed; and wherein said check valve device is drainable when mounted so that the lowest point of said port is located where a vertex of said major axis coincides with the inside wall of the piping system and the fluid flow direction through said check valve device is substantially horizontal, substantially vertical, whether substantially upward or substantially downward, or at any angle between substantially horizontal and substantially vertical including partially upward or partially downward.