CHECK VALVE WITH AXIAL DIRECTION OF FLOW Russian patent published in 2007 - IPC F16K15/06 

FIELD: pipeline valves and fittings.

SUBSTANCE: invention relates to check valves and it can be used for cutting off reverse flow in high-pressure gas main lines. Proposed check valve with axial direction of flow has outer housing with inlet and outlet channels. Inner cone-shaped member in form of Venturi nozzles is made in inner space of housing to form ring channel. Shutoff member is installed in support cup of said member by means of bearing unit. Said shutoff member is made in form of rod with disk and is provided with spring displacement mechanism. Disk is in contact with seat over working surface. Seat is made in form of ring with contact conical surface inscribing seat into profile of ring channel. Seal of seat made in form of stressed two-layer U-shaped element. Said element is installed with its inner space opposite to cutoff flow in ring slot of outer housing in zone of contact conical surface of seat. Bearing unit of shutoff member is formed by at least two relatively overlapping bushings corresponding in assembly to length of support cup of inner cone-shaped member. Zone of overlapping of bushings is made stepped. Length of each zone of overlapping is minimum half as large as thickness of walls of bushings working surface of disk of shutoff member is formed by mated surfaces of sphere and torus, with radius of sphere 3.5 times greater than radius of torus. Tilting of conical contact surface of seat to longitudinal axis of valve is set at angle not exceeding 43 degrees.

EFFECT: improved reliability of valve owing to increased sealing of valve.

5 cl, 4 dwg