| 摘要 |
Pipe integral threaded joint formed by a male element ( 1 ) and a female element ( 2 ) respectively placed on the external surface and on the internal surface of two truncated cone-shaped parts of the threading ( 6, 7, 8, 9 ) having the same conicity value and being radially spaced, both being respectively divided by annular shoulders ( 5, 5 ') which are parallel and orthogonal with respect to the pipe axis. They are provided two sealing surfaces ( 12, 12', 13, 13 '), one of them being cone-shaped and the other being spherical. After the screwing of the two elements ( 1, 2 ) said two annular shoulders ( 5, 5 ') are in contact. Each male ( 1 ) and female ( 2 ) element comprises, respectively along its external and internal surface, a circumference cavity ( 14, 15 ) placed between a part of the threading and the annular shoulder ( 5, 5 ') in order to allow the expansion of the lubricating fat.
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