FIELD: oil industry. SUBSTANCE: surface of the end faces of the distance rings is defined by the inner and outer convex- smooth surfaces. The curvature of the surfaces continuously increases from the top of crossing to the ends. The surfaces intersect at a distance 0.1-0.2 of the width of the ring from its inner edge. EFFECT: enhanced capacity. 3 cl
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Authors
Dates
1997-04-10—Published
1993-09-03—Filed