초록 ▼

A torsion spring return system for a valve closure member, preferably for downhole use in an SSV, is described. The closure member or flapper uses torsion springs which can be wrapped circumferentially within the body of the downhole tool, generally following the periphery of the flapper. Downward r

A torsion spring return system for a valve closure member, preferably for downhole use in an SSV, is described. The closure member or flapper uses torsion springs which can be wrapped circumferentially within the body of the downhole tool, generally following the periphery of the flapper. Downward rotation of the flapper stresses the torsion springs so that subsequently, when a flow tube or other device holding the flapper in one position is released, the torsion springs return the flapper to its seat. The connection between the torsion springs and the pin supporting the flapper is either a universal joint or involves an alignment rod running through the torsion spring, as well as other mechanisms which facilitate stress relief in the connection between the torsion spring and pivot pin.

대표청구항 ▼

[ What is claimed is:] [1.]1. In combination, a closure system and a flapper connected to a base by a pin extending through dual hinges in a downhole valve, and further comprising an edge, said closure system comprising:at least one torsion spring mounted to said base outside said dual hinges and in

[ What is claimed is:] [1.]1. In combination, a closure system and a flapper connected to a base by a pin extending through dual hinges in a downhole valve, and further comprising an edge, said closure system comprising:at least one torsion spring mounted to said base outside said dual hinges and in the plane of said pin, said spring having a curvature to allow said torsion spring to follow the edge of the flapper; anda first tab projecting from said spring, said first tab, when rotated by the flapper producing a stored force in said torsion spring for use in subsequent rotation of the flapper, by said first tab.