CHECK VALVE FOR LOW PRESSURE OPERATING CONDITIONS Russian patent published in 2023 - IPC F16K15/14 

FIELD: check valves.

SUBSTANCE: check valve for low pressure operating conditions, comprising: a valve cover (1), a valve body (2) and an upper diaphragm (3) between the body and the cover, wherein a first pressure cavity (11) is provided on the lower surface of the valve cover (1) and is used to accommodate reverse direction media; on the upper surface of the valve body (2) a second pressure cavity (21) is machined, inside which an inlet channel (22) and an outlet channel are provided, the inlet hole (221) is machined from the inner wall of the inlet channel (22) to the bottom surface of the second cavity (21) pressure, and the medium enters the second pressure cavity (21) from the inlet channel (22) through the inlet port (221) and applies upward pressure to the upper diaphragm (3), causing the upper diaphragm (3) to move towards the valve cover; a return channel (233) in communication with the first pressure cavity (11) is machined on the side wall of the outlet channel, and a portion of the return direction medium that enters the outlet channel can enter the first pressure cavity (11) through the return channel (233), and reverse sealing can be achieved by the pressure difference between the upper and lower surfaces of the upper diaphragm (3).

EFFECT: real check valve opens quickly when the medium passes through the check valve, and the reverse direction seal at low pressure can also be achieved by using the pressure difference on the two sides of the upper diaphragm.

11 cl, 2 dwg