CHECK VALVE Russian patent published in 2021 - IPC F16K15/02 F16K15/06 

FIELD: hydraulic equipment.

SUBSTANCE: invention relates to check valves used in various hydraulic systems, to which there are requirements for stable tightness during the whole service life. Reverse valve includes housing with seat, inlet and outlet holes and main chamber between them, shutoff element interacting with the seat, installed in the chamber with minimum radial gap with guide paths formed in the housing when crossing the surfaces of the main chamber and made in the housing of additional chambers. Length of the guiding paths is larger than the stroke of the shutoff element, and the total effective cross-section area of the additional chambers is equal to the cross-section area of the inlet hole. Locking element is made in the form of a disc pressed to the seat inserted into the housing from the side of the outlet hole and spring-loaded rod with a spherical surface on the working end, interacting with spherical groove made on disc end. Radius of spherical surface of disc recess is larger than radius of spherical surface of rod end. Seat is made in the form of a fluoroplastic bushing installed in an inlet hole and having a shaped surface facing the disc, a profiled surface contacting the rubber pad attached to the disk end face.

EFFECT: technical result is higher reliability of valve operation.

1 cl, 3 dwg