Curved flapper with angle variant seat for a subsurface...

Details Curved flapper with angle variant seat for a subsurface... Curved flapper with angle variant seat for a subsurface...

2005-02-08

2005-02-08

Tsay, Frank (Department: 3672)

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

C166S320000, C166S321000, C251S063400

Reexamination Certificate

active

06851477

ABSTRACT:
A subsurface safety valve for controlling fluid flow in a well bore. In one embodiment, the subsurface safety valve includes a tubular member having a longitudinal bore extending therethrough, a curved flapper removably connected to the tubular member. The curved flapper is configured to pivot against the tubular member between an open position and a closed position. The subsurface safety valve further includes a hard seat positioned inside the tubular member, in which the hard seat defines a seating surface configured to receive a sealing surface defined on a bottom periphery portion of the curved flapper to form a sealing interface having a slope that varies along the sealing interface.

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U.K. Search Report, Application No. GB 0326414.0, dated Feb. 9, 2004.

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