Tubular joint with trapped mid-joint metal-to-metal seal

Pipe joints or couplings – Particular interface – Tapered

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Details

285355, 285390, F16L 2500

Patent

active

045709823

ABSTRACT:
A joint of male and female tubular elements is disclosed where the threads of the female and male members have negative load flanks and have two or more radial steps axially separated one from another by a reverse angle torque shoulder having one or two adjacent conical sealing surfaces. The conical sealing surfaces develop radial positional interference and the reverse angle torque shoulder serves as a positive assembly stop. The negative load flank angle of the threads and the reverse torque shoulder angle combine to interlock the male and female members and to prevent differential radial separation of the engaged conical sealing surfaces when the joint is exposed to internal pressure, external pressure or both. Tapered threads and sealing surfaces and interference threads may advantageously be used in the joint construction.

REFERENCES:
patent: 1927656 (1933-09-01), Eaton et al.
patent: 2211179 (1940-08-01), Stone
patent: 2992019 (1961-07-01), MacArthur
patent: 3224799 (1966-12-01), Blose et al.
patent: 3702707 (1972-11-01), Rosan
patent: 3989284 (1975-11-01), Blose
patent: 4009893 (1977-03-01), Shatton et al.
patent: 4161332 (1979-07-01), Blose
patent: 4192533 (1980-03-01), Blose
patent: 4244607 (1981-01-01), Blose

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