Patent ID: 8757268

Claim:
A float valve assembly for sealing engagement within an oilfield tubular positioned down hole within the well bore for preventing counter flow of fluid-borne debris from within the well comprising: a. a valve member having a conical head portion and a trailing edge portion with beveled off surface from said conical head portion to said trailing edge portion of valve member at a swept back angle from said conical head portion for providing a seating surface substantially all along said beveled off surface to said trailing edge portion and having a stem portion with at least 3 projecting contact stem surfaces defined by the bisected arc of said contact stem surfaces of an angle from 5 degrees to 35 degrees from the center of said stem portion to said contact stem surfaces of said stem portion arranged in a circle equal distance from each other axially extending from said conical head portion of said valve member, b. A biasing member positioned about said stem portion of said valve member for biasing said valve member toward seating engagement of said seating surface of said valve member, c. An upper tubular valve body member having an upper and lower part with axial flow there through and having an internal annular beveled seat for substantially matching said seat with said seating surface of said valve member, and external seals for sealing engagement with said oilfield tubular and threads on said lower part of said upper tubular valve body member, and d. A lower tubular valve body member having an upper and lower part with axial flow there through and having an internal web portion with a central and longitudinal support member which has an axial and circular aperture therein for providing surfaces for support of said at least 3 projecting contact stem surfaces of said stem and allowing axial and circular movement for said stem of said valve member when said stem is inserted in said circular axial aperture and threads on said upper part of said lower tubular valve body member for engagement with said threads of said upper tubular valve body member for joining said upper and lower tubular valve body members and for compressing said biasing member to substantially engage all said seating surface of said beveled off surface of trailing edge portion of said conical head portion of said valve member with said internal annular beveled seat of said upper tubular valve body member for allowing engagement and disengagement of said seating surfaces in response to fluid flow pressure in said float valve.