Well shut off device

Details Well shut off device Well shut off device

1978-10-27

1980-03-18

Schwadron, Martin P.

Valves and valve actuation

Blow-out preventers

166 82, 251212, 277127, E21B 3306, F16K 300

Patent

active

041935748

ABSTRACT:
A hollow closed housing is provided to be interposed in a well casing string and the housing includes vertically spaced upper and lower walls interconnected by first and second pairs of opposite side walls. The upper and lower walls have registered passages formed therethrough relative to which axially spaced lower and upper ends of upper and lower well casing sections may be sealingly secured and a pair of superposed control plates are slidingly mounted within the housing between the upper and lower walls thereof for inverse shifting toward and away from one pair of opposite side walls of the housing between the second pair of housing side walls. The plates have oppositely facing elongated keyhole-shaped opening formed therethrough including large diameter partial cylindrical first ends and small diameter partial cylindrical second ends opening into the first ends remote from the closed ends thereof. The plates are shiftable relative to each other and the housing between first positions with the smaller second ends of the keyhole openings registered in a complementary manner to form a small diameter bore registered and coaxial with the aforementioned passages, second positions with the larger first ends of the keyhole openings registered in a complementary manner to form a large diameter bore registered and coaxial with the passages and third positions with the keyhole openings completely out of registry with the passages.

REFERENCES:
patent: 1788763 (1931-01-01), Gant et al.
patent: 1877268 (1932-09-01), Cole
patent: 2026036 (1935-12-01), Head
patent: 2142179 (1939-01-01), Cole
patent: 2231613 (1941-02-01), Burke
patent: 2718021 (1955-09-01), Baebel

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