CHECK VALVE Russian patent published in 2004 - IPC

FIELD: well drilling technology.

SUBSTANCE: check valve has body having nipple and sub interconnected by threaded connection, a saddle mounted between them with resilient elastic compaction, and locking body in contact with saddle and provided with spring pressing locking body to the saddle. Locking body is made in form of hollow plunger, output of which is made watertight by front and bottom fairings, and in walls of plunger ports are made, plunger is connected with capability for sliding with the saddle, and resilient elastic element is limited in direction of output, at least, by portion of surface of saddle sliding surface, while front fairing is made with choke port, and front and bottom fairings form a technological hollow between each other, which is connected to output of check valve through choke port.

EFFECT: higher level of water-tightness and resource of check valve by means of lessening abrasive and erosive wear and higher water-tightness of pass-tract surfaces of saddle, locking body(plunger) and resilient elastic element, as well as higher smoothness of its opening and closing by means of damping plunger vibrations by means of jet of working fluid from technological hollow formed by front and bottom fairings.

3 cl, 3 dwg