Well reverse flow check valve

Details Well reverse flow check valve Well reverse flow check valve

1985-12-16

1987-08-25

Schwadron, Martin P.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

137 70, 137508, 166317, 166332, F16K 1734, F16K 140, G05D 701

Patent

active

046885935

ABSTRACT:
A reverse flow check check valve for use in a pumping well to prevent backflow when the pump is shut down in which the valve has pump through capabilities for killing the well. The valve includes a housing having a bore with a valve closure element in the bore. A flow tube telescopically moves in the housing upwardly for opening and downwardly for actuating the closing of the member. The flow tube is biased downwardly, preferably by weight, for closing the valve and is responsive to a pressure drop for holding the valve element open. The housing has a port initially closed, but may be opened for pumping through the valve.

REFERENCES:
patent: 2250465 (1941-07-01), Boynton
patent: 2805043 (1957-09-01), Williams, Jr.
patent: 2859762 (1958-11-01), Banker
patent: 2921601 (1960-01-01), Fisher
patent: 2994280 (1961-08-01), Doffin
patent: 3381708 (1968-05-01), Chenoweth
patent: 3451416 (1969-06-01), Nyberg
patent: 4081032 (1978-03-01), Hutchison et al.
patent: 4154303 (1979-05-01), Fournier
patent: 4427070 (1984-01-01), O'Brien
patent: 4494608 (1985-01-01), Williams et al.
patent: 4601342 (1986-07-01), Pringle

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