Screw joint coupling for oil pipes

Details Screw joint coupling for oil pipes Screw joint coupling for oil pipes

1984-09-05

1986-11-18

Husar, Cornelius J.

Pipe joints or couplings

Particular interface

Tapered

285334, 2853342, 2853344, 285370, F16L 1500

Patent

active

046231730

ABSTRACT:
A basic structure of a screw joint coupling for oil pipes according to the invention is that a main sealing portion is constructed with a sealing portion formed axially in convex at an end of a male screw, and with a sealing portion formed in taper at an inner side of a female screw, and that the male screw and the female screw are butted at an end point of the former and an end part of a stopper formed at an inner side of the latter. The main sealing portion has a shrinkage allowance .DELTA.D of the seal part, which is regulated in size in a relation between a shrinkage allowance .DELTA.d of the screw and a pressure P of the sealing part. In addition, specific values are selected as to the load flank angle, the radius of curvature in convex of the sealing portion of the male screw, and the tapering angle of the sealing portion of the female screw.

REFERENCES:
patent: 2051499 (1936-08-01), Siegle
patent: 3870351 (1975-03-01), Matsuki
patent: 4009893 (1977-03-01), Schatton et al.
patent: 4153283 (1979-05-01), Hellmund et al.

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