Johney Barnes

US Patent:

41935748, Mar 18, 1980

Filed:

Oct 27, 1978

Appl. No.:

5/955170

Inventors:

Johney H. Barnes - Redding CA
Lucynda D. Barnes - Redding CA

International Classification:

E21B 3306
F16K 300

US Classification:

251 1A

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.