TH166502B - Threaded couplings for steel pipes - Google Patents

Abstract

A threaded joint is constructed consisting of a dowel (10) and a socket (20). The spur (10) is included in the ranks from the tubular body with the spur (10) towards its free end; Male thread sections (11) and rim (12), including sealing surfaces (13), socket (20) include the female thread (21), corresponding to the male thread (11) of the spur (10); And the recess (22) which corresponds to the rim (12), the recess (22), which includes the sealing surface (23), the rim (12) is included in the ranks from the male thread (11) towards the free end. Of the spur (10): neck part (14); And the sealing head (15), which includes the sealing surface (13), the maximum outer diameter (D1) of the sealing surface area (13) in the sealing head (15) is larger than the outer diameter (D2 ) Of the neck (14) at the boundary between the neck (14) and the male thread (11), this threaded coupling can reliably provide high leakage performance while maintaining the resistance performance. High torque of the tapered threaded tongue plinth:

Claims (1)

1.Spiral coupling for steel pipes Which includes Pipe dowel and tubular socket The dowel and the box are fixed by screwing the dowel onto the box. The dowel which consists of In ranks from a tubular body with a spur to its free end: a tapered male thread with a tongue plinth; And the rim, including the surface to prevent leakage Box which includes: Female tapered part with a plinth thread: