FLANGE CONNECTION FOR PIPES AND APPARATUSES Russian patent published in 2019 - IPC F16L23/32 

FIELD: valve industry.

SUBSTANCE: invention relates to flange connection for pipes and apparatus. Contact surface of the flanges is made in the form of a spatial body containing elements of a flat ring, an ellipsoid and a cone, which are serially conjugated in the direction from the central axis of the flanges to the periphery. Angle between cone surface and cone generatrix makes 0.3–1.2 degrees, and flange groove is made in form of rectangular trapezium, wherein groove depth H is determined from the relationship: H=K1×0.5W, where: W is the width of the metal annular gasket. Conical contact surfaces are made on metal ring gasket on outer side opposite to each other, and unloading circular groove is made in central part. In holes of flanges for installation of studs on the side of nuts arrangement there are spherical bores opposite to spherical surfaces made on nuts. Contact surfaces of flanges, grooves and metal ring gasket are treated with modifying antifriction composition based on fluorine-organic compounds.

EFFECT: increased reliability of flange connection and increased operational reliability at ultrahigh pressures of working medium.

3 cl, 5 dwg