CHECK VALVE Russian patent published in 2020 - IPC F16K15/14 F16K47/02 

FIELD: valve industry.

SUBSTANCE: invention relates to valve industry and is intended to prevent backflow of working medium. Check valve includes housing with sealing sections, rotary shutoff element and seat. Shutoff element is a round elastic disc consisting of peripheral and central sections, wherein peripheral is made in form of ring, profile of which in longitudinal section has the form of rectangular triangle with central hypotenuse facing the center, and central part of segment of ball reinforced with metal. Peripheral section is smoothly connected to central by cross-connection. Body on the side of the cross-connection is equipped on the outside with a setting handle, and the seat is equipped with a diffuser section at the inlet. Sealing sections of the housing are made in the form of aligned surfaces located on periphery from two sides and made with possibility of interaction with corresponding centering surfaces of flanges with sealing by appropriate sealing rings on the adjoining surface. In the body on the opposite side of the seat, a cylindrical recess is made coaxially to it, the diameter corresponding to the outer diameter of the ring of the shut-off element with an annular groove for the spring washer, which fixes in the cylindrical recess a ring with a conical surface made with possibility of tight pressing of the ring of the shut-off element to the body. On the side of the seat in the segment of the ball there made is a recess in the form of segment of sphere with diameter in the base approximately equal to diameter of the seat.

EFFECT: proposed design of check valve allows reliable and tight sealing of housing in flange for a long period of time and reduces costs for pumping liquid through check valve, as well as for repair of valve, associated with failure of cross-connection.

1 cl, 1 dwg