CHECK VALVE Russian patent published in 2006 - IPC F16K15/06 

FIELD: mining.

SUBSTANCE: check valve comprises housing, conical chamber, valving member with the axle, and conical plug. The housing has two openings at its center. One of the openings is used for fluid flow and is provided with flexible bushing mounted on the outer surface of the housing that cooperates with the inner surface of the pump-compressor pipe. The other opening receives the valving member whose axle with the collar and conical plug are interconnected by means of a threaded joint through the side passages in the chamber. The outer side of the housing is provided with projections that cooperate with the faces of the pump-compressor pipes connected with the clutch. The valving member is mounted with a spaced relation between the collar of the axle and the member that overlaps the opening for fluid flow when the conical surface of the plug cooperates with the chamber.

EFFECT: reduced cost, enhanced reliability, and prolonged service life.