THREADED CONNECTION FOR STEEL PIPES Russian patent published in 2018 - IPC F16L15/04 

FIELD: machine building.

SUBSTANCE: invention relates to a threaded joint made of nipple (10) and clutch (20), clutch (20) having an outer diameter less than 104% of the outer diameter of the tubular body having nipple (10). Clutch (20) includes from the end of the clutch to the tubular body: lip portion (24) and threaded portion (21) lip portion (24) includes step surface (22) and sealing surface (23). Nipple (10) includes shoulder surface (12), sealing surface (13) and male threaded portion (11). Bench surfaces (12, 22) are inclined relative to the plane perpendicular to axis (CL) of the pipe, in the direction in which nipple (10) is screwed on. Lip portion (24) of clutch (20) has nose portion (25) disposed between bench surface (22) and sealing surface (23), and annular portion (26) disposed between sealing surface (23) and cross-sectional thread portion (21). Nose portion (25) and annular portion (26) do not contact nipple (10), and the length of annular portion (26) is larger than the thread pitch of cross-sectional threaded portion (21).

EFFECT: invention improves coupling reliability.

8 cl, 7 dwg, 1 tbl