Patent ID: 6877525
Filing Date: 2005-04-12
Classification: F16K,Y10T

Abstract:
1. A check valve for a fuel pump comprising: a valve housing adapted to be disposed in an outlet member of the fuel pump; a valve seat formed on an interior surface of said valve housing, said valve seat having a generally frustaconical cross-sectional shape; a valve member disposed in said valve housing and having a closed position to engage said valve seat to prevent fuel from flowing through the outlet member and an open position to allow fuel to flow through the outlet member, said valve member having a hub with a generally hemi-spherical shape and an annular groove extending radially into said hub and a seal disposed in said groove for contacting said valve seat when said valve member is in said closed position; a spring disposed about said valve member and located axially between said valve seat and one end of said valve housing to urge said valve member toward said valve seat; and said valve member having at least one outlet port disposed below said groove and located axially between said valve seat and the one end of said valve housing when said valve member is in said closed position to prevent fuel flow, said valve member traveling a predetermined dwell distance before said outlet port is exposed and fluid flow can exit past said valve seat when said valve member is in said open position, creating a flow area large enough to prevent a venturi that limits travel of said valve member.