Curved flapper valve

Details Curved flapper valve Curved flapper valve

2002-09-05

2004-08-10

Tsay, Frank (Department: 3672)

Wells

Valves, closures or changeable restrictors

Longitudinally movable operator

C166S373000, C251S359000

Reexamination Certificate

active

06772842

ABSTRACT:

BACKGROUND
1. Field of the Invention
This invention pertains to flapper valves, and particularly to flapper valves used for well completions.
2. Related Art
Flapper valves are often used in subsurface safety valves. Subsurface safety valves are used in wells to contain wellbore fluids, particularly in the event of emergency situations in which there is potential danger to personnel, equipment, or the environment.
SUMMARY OF THE INVENTION
The present invention improves flapper valves by providing a curved flapper and a seat, the flapper and seat each having complementary undulating and tapered perimeters, with sealing surfaces designed to maintain seal integrity under higher pressure, for a given outer diameter to inner diameter ratio, compared to prior art flapper valves.


REFERENCES:
patent: 2162578 (1939-06-01), Hacker
patent: 2849207 (1958-08-01), Conrad
patent: 4427071 (1984-01-01), Carmody
patent: 4433702 (1984-02-01), Baker
patent: 4457376 (1984-07-01), Carmody et al.
patent: 4457379 (1984-07-01), McStravick
patent: 4531587 (1985-07-01), Fineborg
patent: 4776400 (1988-10-01), Jacob et al.
patent: 4813481 (1989-03-01), Sproul et al.
patent: 4926945 (1990-05-01), Pringle et al.
patent: 4983803 (1991-01-01), Pringle et al.
patent: 4986358 (1991-01-01), Luedrs et al.
patent: 5125457 (1992-06-01), Meaders
patent: 5137089 (1992-08-01), Smith et al.
patent: 5137090 (1992-08-01), Hare et al.
patent: 5145005 (1992-09-01), Dollison
patent: 5188182 (1993-02-01), Echols et al.
patent: 5263847 (1993-11-01), Akkerman et al.
patent: 5310005 (1994-05-01), Dollison
patent: 5323859 (1994-06-01), Smith et al.
patent: 5564502 (1996-10-01), Crow et al.
patent: 5682921 (1997-11-01), Rawson et al.
patent: 5823265 (1998-10-01), Crow et al.
patent: 5862864 (1999-01-01), Whiteford
patent: 5918858 (1999-07-01), Rawson et al.
patent: 6079497 (2000-06-01), Johnston et al.
patent: 6209663 (2001-04-01), Hosie
patent: 6230808 (2001-05-01), French et al.
patent: 6263910 (2001-07-01), Davis et al.
patent: 6289926 (2001-09-01), Dennistoun
patent: 6315047 (2001-11-01), Deaton et al.
patent: 6328109 (2001-12-01), Pringle et al.
patent: 2001/0007284 (2001-07-01), French et al.
patent: WO 97/28349 (1997-08-01), None
patent: WO 98/59150 (1998-12-01), None
patent: WO 00/17482 (2000-03-01), None
patent: WO 01/36787 (2001-05-01), None

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