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

FIELD: pipeline construction.

SUBSTANCE: invention relates to control systems, in particular to check valves. The check valve contains a cylindrical body, a valve seat with a working outlet channel, a spring-loaded conical poppet valve with a shank with the possibility of axial movement and interaction with the seat. The inner diameter of the body on the inlet side is less than the inner diameter of the body on the downstream side. A three-arm bushing is installed in the body on the downstream side, forming working output channels between its bridges and having an internal cylindrical bore into which a guide bushing with an internal guide hole for the poppet valve shank is pressed. On the surface of the poppet valve from the side facing the valve seat, a concentric groove is made into which a sealing element is installed. A sharp edge is made along the inner circumference of the valve seat with the possibility of interacting with the sealing element of the poppet valve. The shank of the poppet valve is made on the inner side of the poppet valve, and the hole of the guide sleeve in the cross section is made in the form of a square.

EFFECT: invention is aimed at improving reliability and tightness of the check valve and the pressurization line as a whole.

3 cl, 1 dwg