| 摘要 |
A fluid-tight pipe union includes: first and second annular fittings attachable to a connection ends of first and second lengths of pipe, respectively, the fitting mating together at a junction, the first fitting incorporating a circumferential flange, said flange having a rear face and front face which faces said second length of pipe, the second fitting having a circumferential shoulder terminating in an inwardly-angled, overhanging circumferential step that faces away from said junction; a clamping collar comprised of arcuate segments, which are collectively sized to generally and coaxially surround both said first and second fittings, the collar incorporating, both an inwardly-angled clamping ledge that engages the overhanging step of the second fitting and at least one internal, inwardly-angled, spiral, circumferential thread spaced apart from said clamping ledge; and a retainer ring sized so as to be slidable over said first fitting, and rotatable against the rear face of said circumferential flange, said retainer ring incorporating external, spiral, circumferential threads that are angled away from the said flange, the external threads of said retainer ring engaging the internal threads of said clamping collar to draw the clamping ledge and engaged second fitting against the flange as the retainer ring is rotated in a thread engaging direction. The union may further include a metal seal crushable or a resilient O-ring seal compressible between the first and second annular fittings.
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