NON-RETURN VALVE Russian patent published in 2011 - IPC F16K15/06 

FIELD: mining.

SUBSTANCE: non-return valve includes body, inlet and outlet branch pipes, partition with central hole, stabiliser with conic and support surfaces, locking member located in the body so that it can moved. On one side between seal in the body and end surface in the groove of the body there installed is clamp cover and ring with sealed conic surface at α angle. On other side in the valve body there installed is guide bushing with conic surface at β angle. In central channel of guide bushing there installed is streamlined plug with possibility of its being moved in liquid flow direction and its interacting with the appropriate conic surfaces of ring and guide bushing. Streamlined plug has tight unloading chamber for balancing of mass of plug volume with mass of volume of displaced fluid. By means of inlet and outlet branch pipes there symmetrically installed are screws with eccentric flanges and expansion nuts for interaction both with end surfaces of branch pipes and with other surface of valve body through eccentric flanges of screws.

EFFECT: reduction of element base of the valve design and reduction of labour costs both during manufacture and during its service at operation.

3 dwg