PIPELINE JOINT Russian patent published in 2010 - IPC F16L19/00 

FIELD: construction.

SUBSTANCE: pipeline joint includes captive nut, nozzle with inner conical surface, nipple with inner conical surface, band ring with inner conical surface coupled with outer conical surface of nipple, and outer cylindrical surface coupled with inner cylindrical surface of captive nut. Joint comprises stepped bushing with sealing edges arranged in areas of steps rotation surfaces crossing with their end surfaces.

EFFECT: possibility of rational selection of sealing elements parametres depending on materials of joined pipes, their mechanical properties and working pressure in joint, prevention of its spontaneous unsealing, simplified replacement of sealing element and reduction of axial forces in joint tightening.

6 cl, 3 dwg