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. Shutoff element is made up of seat with spring-loaded disc and arranged inside inner unit case. Said inner block represents a shaped solid of revolution, preferably, a cylinder, arranged inside valve body along dischargeable component line. Shutoff element lengthwise axis is located perpendicular to dischargeable element branch pipe axis. Chamber communicated via channels with valve body inner chamber is arranged above valve disc. Said channels are open upstream. 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. Valve body cover represents hollow cylinder with one closed end face to make closed gas chamber inside said cover, between cover end face and inner unit end face.

EFFECT: higher reliability.

2 dwg