HIGH PRESSURE FLANGE COUPLING WITH DIELECTRIC UNION FITTING Russian patent published in 2012 - IPC F16L25/02 

FIELD: pipeline coupling.

SUBSTANCE: coupling comprises the flange connection with holes for standard fastening elements; fastening elements: bolts, nuts and ring plates; a dielectric spacer between the flanges; dielectric inserts in the form of dielectric bushings and plates isolating the fastening elements from the flanges, of a dielectric pipe inside the flange connection to extend the dielectric clearance. Flanges have a cylindrical nose with threaded openings, where pressure bolts are positioned uniformly around the nose, these bolts thrust against metal rings positioned in the flange rings. When the pressure bolts are tightened, metal rings move and press the sealing gaskets, which are also positioned in the flange rings between the dielectric spacer, metal ring and cylindrical noses.

EFFECT: reliable pressurization of the flange coupling.

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