Fully opening flapper valve apparatus

Details Fully opening flapper valve apparatus Fully opening flapper valve apparatus

1981-07-06

1984-02-28

Nilson, Robert G.

Fluid handling

Line condition change responsive valves

Direct response valves

137527, F16K 1503

Patent

active

044337027

ABSTRACT:
An improved flapper valve for installation for example, in a tubing string of a subterranean well is pivotally movable about a horizontal axis into a blocking position relative to the vertical fluid flow path of the tubing string. The flapper valve is circular and is formed from a tubular segment in such a manner that, when in the open position, its concave surface is substantially tangentially coincident with a projection of the cylindrical surface formed by the inside of the valve seat, and its convex surface prescribes a much larger chordal distance in a containing circle concentric with the valve seat than would a flat surface of the same diameter. Thus, a valve is provided wherein for a given housing diameter, the passageway through the valve can be proportionately larger.

REFERENCES:
patent: 474843 (1892-05-01), Mahan
patent: 1000719 (1911-08-01), Cram
patent: 1926759 (1933-09-01), Wallman
patent: 2162578 (1937-05-01), Hacker
patent: 3937240 (1976-02-01), Nanny
patent: 4054153 (1977-10-01), Guyton

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