CHECK VALVE Russian patent published in 2012 - IPC E21B34/02 F16K15/02 

FIELD: machine building.

SUBSTANCE: check valve comprises body and branch pipes for primary and dischargeable components. Shutoff element consists of fixed and moving parts interacting over common equidistant surface and is arranged inside valve body along dischargeable component line. Chamber is arranged above valve disc communicated with valve body inner chamber. Note here that channels open downstream. Cover is fitted in valve body mating part to lock inner unit with shutoff element. Said inner unit is heat-isolated from valve body by nonmetallic ring seals. Note here that gas chamber is arranged between said inner unit and valve body. Link mat be arranged inner unit case end facing the cover to interact with said case by its one end and by opposite end, preferably, shaped one, with valve body cover inner surface made up of hollow cylinder with one closed end. Clearance is provided for between cover thrust surface and inner unit end face. Said valve body cover inner surface made up of hollow cylinder with one closed end interacts with inner unit case end face.

EFFECT: higher reliability.

3 cl, 3 dwg