Flexible piston well safety valve

Details Flexible piston well safety valve Flexible piston well safety valve

1985-03-18

1986-07-22

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 92137, E21B 3410

Patent

active

046013415

ABSTRACT:
A subsurface well safety valve having a housing with a valve closure member which is controlled by a flow tube which includes an improved hydraulic actuating mechanism. The housing includes a cylinder with a straight portion and a curved portion which is adapted to receive hydraulic fluid from the surface and a piston is movable in the cylinder and connected to the flow tube for moving the flow tube to an open position. The piston includes a metal seal and a flexible portion connected to the top of the metal seal and the flexible portion is adapted to move through the curved portion of the cylinder. A valve and a valve seat are provided in the cylinder above the piston for sealing the hydraulic fluid from the well surface when the valve is open and for engaging and holding the flexible portion and the piston in the open position.

REFERENCES:
patent: 3965802 (1976-06-01), Jacobs
patent: 4161219 (1979-07-01), Pringle
patent: 4444266 (1984-04-01), Pringle
patent: 4452310 (1984-06-01), Pringle et al.
patent: 4467705 (1984-08-01), Reist
patent: 4467870 (1984-08-01), Langham
patent: 4484511 (1984-11-01), Dibrell
patent: 4495908 (1985-01-01), Pringle
patent: 4503913 (1985-03-01), Carmody
patent: 4527630 (1985-07-01), Pringle

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