Circulation valve

Details Circulation valve Circulation valve

1981-08-20

1984-05-01

Pate, III, William F.

Wells

Valves, closures or changeable restrictors

Destructible element

166332, E21B 3408

Patent

active

044455712

ABSTRACT:
A circulation valve includes a cylindrical housing having an open bore therethrough and a circulating port through a wall thereof. A valve mandrel is slidably received in the housing and movable from a closed position closing the circulating port to an open position opening the circulating port. The circulating port is in fluid communication through an inner bore of the valve mandrel with the open bore of the housing above the valve mandrel when the valve mandrel is in its open position. A shear pin initially retains the valve mandrel in its closed position. A spring moves the valve mandrel to its open position upon shearing of the shear pin.

REFERENCES:
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patent: 4063593 (1977-12-01), Jessup
patent: 4064937 (1977-12-01), Barrington
patent: 4298077 (1981-11-01), Emery

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