STEEL PIPE THREADED JOINT Russian patent published in 2017 - IPC F16L15/04 

FIELD: construction.

SUBSTANCE: threaded connection (1) consists of the male section (13) and the coupling part (12). The male section (13) includes a stop surface (59), a sealing surface (56) and a male threaded section (51). The coupling part (12) includes a stop surface (24), a sealing surface (22) and a female threaded section (21). Both the male threaded section (51) and the female threaded section (21) are a tapered threaded area including thread turns (57, 31) with a trapezoidal profile. The male threaded section (51) has a thread width (57) that gradually decreases along the screw thread line, and the width of the grooves (62), which gradually increases along the screw thread line. The female threaded section (21) has a grooves (42) that gradually decreases along the screw thread line, and the width of the thread turns (31), which gradually increases along the screw thread line.

EFFECT: avoiding jamming during assembly while maintaining high sealing ability, ease of manufacture.

5 cl, 8 dwg, 3 tbl