HYDRAULICALLY-OPERATED SHUTOFF VALVE OF CARTRIDGE TYPE Russian patent published in 2015 - IPC E21B34/10 

FIELD: oil and gas industry.

SUBSTANCE: tubing string assembly comprises a setting case connected by threaded connection to the pipe string. The case is made with a groove for placement of latch mechanism and a groove for delivery chamber with opening to interchange with hydraulic control line. The groove is placed between the upper and lower systems of seals. The system is made with upper and lower inner seals, which are mated to a locking body. The system is made with upper and lower outer seals, which are mated to inner surface of the case. The locking body is made stepped, its upper step is placed in the lower system of seals and its lower step may interact with a saddle. The upper step is placed between the upper and lower seals; together with the lower system of seals it forms a cavity coupled to the chamber by means of opening.

EFFECT: improved function of control of the locking body, reduced labour costs at maintenance, repair and servicing.

2 cl, 4 dwg