Pipe joints or couplings – With casing – lining or protector – Lined
Patent
1998-01-12
2000-04-04
Arola, Dave W.
Pipe joints or couplings
With casing, lining or protector
Lined
2851334, 285197, 285332, 285906, F16L 914
Patent
active
060451629
ABSTRACT:
To provide both a high-pressure metal piping capable of preventing the cavitation or the like or the internal fatigue destruction, as might otherwise occur at a joint head at a branch tube due to the repeated internal pressure of a fluid, and capable of eliminating a fear of corrosion even if a corrosive high-pressure fuel is employed, and a common rail to which the piping is jointed. At a joint portion of a thick steel tube having a relatively small diameter, a joint head is formed of a radially enlarged portion having a larger diameter than that of the thick steel tube, and the radially enlarged portion is formed on its inner circumference into a tapered pressure seat which is diverging outward for a receiving seat of the common rail. Preferably, a thin inner tube, as made of a corrosive metal, is fitted on the inner circumference of the thick steel tube all over the length and is terminated at the tapered pressure seat of the thick steel tube. With this construction, according to the invention, the annular recess (or pocket), as might otherwise appear in the inner circumference as the joint head is formed, is eliminated to enhance the internal pressure strength of the joint head thereby to prevent the cavitation or the like or the axial or circumferential cracks in the joint head and to eliminate a fear of corrosion even if a corrosive fuel is employed.
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Arola Dave W.
Casella Anthony J.
Hespos Gerald E.
Usui Kokusai Sangyo Kaisha Limited
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