SEALED THREADED CONNECTION OF CASING PIPES Russian patent published in 2014 - IPC F16L15/04 E21B17/42 

FIELD: machine building.

SUBSTANCE: sealed threaded connection for casing pipes from unplasticised polyvinylchloride comprises a male element and a female element with trapezoid thread profile, the female pipe end comprises an elongated socket with the inner diameter being less than the outer male element diameter by double height of the thread profile. The thread on the male and female elements is fitted by cone sections, the pipe section before the first thread turn is additionally fitted by a lead-in rib made as a cone. Additional leakproofness of the threaded connection is achieved due to a rubber packing ring set after the outer thread of the male element and adjoining the smooth cylindrical part of the lead-in rib on the inner thread on the female element.

EFFECT: improved strength and resistance of the threaded connection to axial and radial loads and the improved leakproofness of the threaded connection.

4 dwg