STEEL PIPE THREADED JOINT Russian patent published in 2012 - IPC F16L15/04 

FIELD: machine building.

SUBSTANCE: steel pipe threaded joint includes nipple having external taper thread, taper sealing surface and end support surface, and coupling having internal taper thread, taper sealing surface and support surface, which has the possibility of being screwed up easily and has increased tightness due to sealing surface that is located so that nipple and coupling have non-contact area. Peripheral surfaces of nipple and coupling do not touch each other between sealing surfaces and support surfaces. At least some part of non-contact area of nipple, which adjoins the nipple end, is a part with tapered surface having mainly the same inclination angle as tapered sealing surface, and non-contact area of coupling is mainly cylindrical surface.

EFFECT: invention improves reliability of pipe joint.

8 cl, 11 dwg