Subsurface well safety valve with curved flapper and method of m

Details Subsurface well safety valve with curved flapper and method of m Subsurface well safety valve with curved flapper and method of m

1989-09-07

1990-05-22

Massie, IV, Jerome W.

Wells

Valves, closures or changeable restrictors

Fluid operated

137522, 137527, 1375276, 166316, 166319, 166325, 166332, E21B 3406

Patent

active

049269453

ABSTRACT:
A subsurface well safety valve having a curved flapper closure member and method making. The curved flapper has a concave sealing surface coacting with a valve seat. A flow tube has a lower end contoured to the flapper sealing surface. A flapper can be made out of a tubular member in which the inside has been honed providing a flapper with a concave surface which forms a sealing surface.

REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 4531587 (1985-07-01), Fineberg
patent: 4691776 (1987-09-01), Pringle
patent: 4703805 (1987-11-01), Morris
patent: 4834183 (1989-05-01), Vinzant et al.

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