Patent ID: 7841416
Filing Date: 2010-11-30
Classification: E21B

Abstract:
1. A subsurface safety valve apparatus, the apparatus comprising: a spring housing comprising first and second ends, wherein at least a portion of the second end exhibits a generally conical shape; a non-metallic sealing ring concentrically located around the generally conically-shaped portion of the second end of the spring housing, the non-metallic sealing ring comprising a flanged upper end; a retainer ring adapted to retain the non-metallic sealing ring around the generally conically-shaped portion of the second end of the spring housing; at least one hinge post connected to the second end of the spring housing; a flapper connected to the at least one hinge post, the flapper operable to rotate between an open and closed position; and a gap between the flanged upper end of the non-metallic sealing ring and a bottom side of the second end of the spring housing.