Safety valve and ball type equalizing valve

Details Safety valve and ball type equalizing valve Safety valve and ball type equalizing valve

1977-08-04

1978-08-01

Leppink, James A.

Wells

Valves, closures or changeable restrictors

Fluid operated

166332, 137629, 251347, 251353, E21B 4312

Patent

active

041037448

ABSTRACT:
An equalizing valve is incorporated in a subsurface shutoff valve for wells and has a number of balls loosely confined in an annular groove in the tubular valve body and adapted to seat in by-pass ports in the shutoff valve actuator piston sleeve to prevent flow through such by-pass ports from ports in valve body which communicate with the groove. Actuation of the piston sleeve to open the shutoff valve causes a shoulder forming the groove to wipe the seated balls from the by-pass ports to equalize fluid across the shutoff valve before it is opened. The shutoff valve is of the ball type or of another type. The shutoff valve of the ball type, when closed, subjects its support bars to a force deforming them to allow the shutoff valve ball to move into seating engagement with a seating sleeve to prevent extrusion of an elastmer seal.

REFERENCES:
patent: 2133272 (1938-10-01), Coberly
patent: 3078923 (1963-02-01), Tausch
patent: 3249124 (1966-05-01), Berryman
patent: 3971438 (1976-07-01), Crowe

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