Patent ID: 6289926
Filing Date: 2001-09-18
Classification: E21B,F16K,Y10T

Abstract:
A subsurface safety valve adapted to be placed in a well tubing string to control flow therethrough comprising:a valve housing having a bore therethrough;a flapper closure plate mounted within the bore of the housing and movable between a valve open position and a valve closed position, the flapper closure plate having a sealing surface;an operator movably disposed within the bore of the housing for controlling movement of the flapper closure plate between the valve open position and the valve closed position; anda valve seat disposed within the valve housing, the valve seat having a flow passage bore, a sealing surface and an internal load bearing shoulder, in the closed position, the sealing surface of the flapper closure plate sealingly engaging the sealing surface of the valve seat and the internal load bearing shoulder of the valve seat defining the maximum travel of the flapper closure plate.