CHECK VALVE Russian patent published in 2008 - IPC F16K15/04 F16K17/12 

FIELD: check valve.

SUBSTANCE: check valve comprises housing with flowing passage. The housing receives the grid, seat, and valving member that cooperates with the seat. The valving member is provided with the guiding, seating, and shank members. The valving member is made of two interconnected balls. The bottom ball overlaps the valve and is made of flexible polymeric conducting material for permitting interaction with the appropriate surface of the seat. The seat is set in flexible polymeric conducting grid provided with side ribs and passages between them for flowing fluid to be pumped. The top ball is a ballast one and is made of metal or polymer. The top ball cooperates with the overlapping ball that is mounted with a spaced relation to the inner diameter of the flexible polymeric conducting grid.

EFFECT: enhanced reliability.

5 dwg