NOZZLE CHECK VALVE Russian patent published in 2019 - IPC F16K15/02 F16K15/06 F16K15/12 

FIELD: machine building.

SUBSTANCE: present invention relates to nozzle check valves for gaseous and liquid media. Nozzle check valve comprising valve body (10) and nozzle (20) located centrally inside upstream end of valve body (10), flow channel (90) defined by nozzle outer surface (20) and inner surface of body (10) valve. On axial extension (26) of nozzle guide bushing (60) is installed, wherein annular tray (30) containing sealing ring (31) of tray, connected to central bushing (32, 33) by multiple bridges (34), is installed on guide bushing (60) for axial movement of annular tray (30) relative to valve body for opening and closing of flow channel (90). Spacer element (80) is located on axial extension (26) of the nozzle downstream of guide bushing (60), at that on the downstream side of spacer element (80) diffuser (40) is located. Spring (50) between ring tray (30) and diffuser (40) pushes the tray towards the closed position of the valve. Valve travel, maximum movement of annular tray (30) from closed position of valve to its open position, in which annular tray (30) comes into contact with diffuser (40) upper surface, is determined by axial length of spacer element (80). Center of mass of ring tray (30) is located on central axis of tray (30) where central sleeve (32) enters sliding contact with guide bushing (60).

EFFECT: present invention allows the user to change the valve tray travel in place by replacing the spacer element with the spacer element of the other length without the need to return the valve to the plant.

13 cl, 3 dwg