DIVERTER VALVE FOR CIRCULATING AND CONTROLLING A FLOW OF SUBSTANCE Russian patent published in 2006 - IPC E21B34/02 E21B34/06 

FIELD: technology for forcing substance and/or extracting fluid from well formations.

SUBSTANCE: valve includes shaft, which has one or more radial hydraulic channels, upper thimble or lower sub, upper and lower tubular threads with similar or different diameters. Shaft is made on one end with external threaded recess for spiral spring and adjusting nut, also with two external mounting surfaces with different diameters and grooves for packing elements, and differential piston mounted on two external mounting surfaces with or without an external support nut. Piston forms a hydraulic chamber together with shaft, connected to shaft hollow through one or several radial hydraulic channels. In accordance to invention in shaft, on another end, made additionally are external threaded recess for spiral spring and adjusting nut and a mounting surface. On external mounting surface, additional differential piston is mounted with or without threaded radial apertures, drive limiter, clamp, and internal packing, or a protective bushing is positioned for overlapping packing elements in grooves on middle external mounting surface of shaft during circulation of flow of substance through one or more radial hydraulic channels. Additional differential piston forms an additional hydraulic chamber with shaft, connected to shaft hollow through one or more additionally made radial hydraulic channels. Either both differential pistons or differential piston and protective bushing interact with each other under force from one or both spiral springs. In staring closed position of valve, packing elements in grooves hermetically isolate upper and/or lower hydraulic chambers from external space, and in working open position of valve, with upward or downward movement of differential piston, either another differential piston or protective bushing may overlap packing elements, thus preventing movement of a flow of substance through them.

EFFECT: increased reliability, efficiency and functionality of operation of diverter valve.

14 cl, 17 dwg