Patent ID: 6105609
Filing Date: 2000-08-22
Classification: F16K,Y10T

Abstract:
A check valve assembly for an internal combustion engine comprising a cup-shaped check valve housing having a cylindrical wall, an open end, and an upstream closed end, to define a chamber, and an inlet passage extending through said closed end to introduce flow to said chamber, a filter assembly received in said chamber and adjacent said upstream closed end of said check valve housing, having a circular filter medium and an overmolded filter o-ring, a valve seat member received in said chamber of said check valve housing downstream of said filter assembly and having an annular ring slidingly received in said cylindrical wall and a valve seat extending radially inward from said annular ring and having a central opening, a circular valve disk oriented in said chamber, downstream of said valve seat member, operable to close said central opening to prevent flow upstream through said check valve assembly and to flex allowing flow downstream through said central opening, a check valve cap partially received within said housing to mate with said annular ring of said valve seat member and having a radial flange extending about an outer circumference, which provides a seating shoulder for said open end of said check valve housing, and a weld seam provided between said radial flange of said cap and said open end of said check valve housing wherein said weld seam is located at a downstream end of said check valve assembly and said filter assembly is located at said upstream closed end to reduce the risk of distortion of said filter medium during welding.