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US 4,926,945 AGranted
Subsurface well safety valve with curved flapper and method of making
AssigneeCamco, Incorporated
InventorsRonald E. Pringle, Arthur J. Morris
Life of this patent
Estimating the term…
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.
Claims7
A subsurface well safety valve for controlling the fluid flow through a well conduit comprising,
- a housing having an axial bore therethrough,
- a valve seat positioned in the housing,
- a valve closure member movable between open and closed positions relative to the valve seat, said valve closure member being a sector of a cylinder having a concave surface which forms a sealing surface,
- said valve seat having a seating surface contoured to coact with the sealing surface,
- a flow tube telescopically movable in the housing for controlling the movement of the valve closure member, the lower end of the flow tube having a surface contoured to coact with the concave sealing surface and being substantially equal to the contour of the concave sealing surface, and
- hydraulic piston and cylinder means in the housing actuating the flow tube.
3 more elements
A subsurface well safety valve for controlling the fluid flow through a well conduit comprising,
- a housing having an axial bore therethrough,
- a valve seat positioned in the housing,
- a valve closure member movable between open and closed positions relative to the valve seat, said valve closure member being a sector of a cylinder having a concave surface which forms a sealing surface,
- said valve seat having a seating surface contoured to coact with the sealing surface,
- a flow tube telescopically movable in the housing for controlling the movement of the valve closure member, the lower end of the flow tube having a surface contoured to coact with the concave sealing surface and being similar to the contour of the concave sealing surface, and
- said lower end of the flow tube having a curved surface defined by a radius no greater than the radius of the concave sealing surface and positioned closely adjacent the concave sealing surface when the safety valve is in the closed position.
3 more elements
Dependencies are inferred from the claim text.