CHECK VALVE Russian patent published in 2006 - IPC F16K15/02 

FIELD: mining.

SUBSTANCE: check valve comprises housing, valving member mounted at the axis, baffle for valving member with passages for hydraulic connection, stabilizer mounted at the end of the axis and provided with the conical surface, and passages for hydraulic connection. The stabilizer is provided with the control valve. The housing is provided with the recess from one side for receiving the baffle with the passages for the hydraulic connection and central opening and, from the other side, with two chambers for receiving the bushing with the bearing surface for the control ring and passages for the hydraulic connection and axis connected with the baffle through the central opening via the threaded members. The inner surface of the bushing to be sealed and the bearing surface of the control valve are made for permitting the cooperation with the corresponding surfaces of the valving member when they moves and close the passages for hydraulic connection of the stabilizer and baffle.

EFFECT: enhanced reliability.

1 cl, 6 dwg