CHECK-CUT-OFF VALVE Russian patent published in 2023 - IPC F16K17/04 F16K17/10 

FIELD: mechanical engineering.

SUBSTANCE: valves designed to control the flow of liquid through product pipelines. The essence of the invention is that in the body of a check-cut-off valve in the guide hole of a piston with sealing rings along the body, a rod with a stepped sleeve is installed with the ability to move, which is a support for the adjustment spring, through which the rod presses the plate to the seat. By changing the valve opening pressure by alterating the force of pressing the plate to the seat with an adjusting spring, the hydraulic resistance of the supply pipelines is adjusted to the required value. In addition, the adjusting spring is located inside the power spring, which is additionally compressed by a stepped bushing until the shoulder stops against the threaded stop, at high pressures of the working fluid.

EFFECT: obtaining a valve with a simple design, with a stable characteristic, operating in a wide range of pressures of the working fluid, advanced in the manufacture and adjustment of both the valve itself and in the manufacture of the product.

1 cl, 1 dwg