SEALED THREADED CONNECTION OF CASING PIPES (VERSIONS) Russian patent published in 2014 - IPC F16L15/00 E21B17/08 E21B33/38 

FIELD: machine building.

SUBSTANCE: connection includes male and female elements, on the ends of which there are thrust trapezoid-shaped threads on outer and inner surfaces respectively, which have obliquity of 1:16, an inclination angle of a support edge of turn profile of 2-4° to the normal of an axial thread line and an inclination angle of a captivating edge of turn profile of 9-11° to the normal of the thread axial line. The connection has an internal sealing assembly formed with thrust end surfaces contacting to each other and located perpendicular to the thread axial line. Length of the thrust end of the male element is 6.9-100.3 mm. A version of a connection configuration is described.

EFFECT: tightness of the connection at interaction of considerable differently directed loads, and wear resistance of the connection.

2 cl, 2 dwg, 1 tbl