Machine welded obturator
AssigneeConstructions Metalliques de Provence
InventorsRaymond A. Laignel, Patrick F. Mommeja
Life of this patent
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Abstract
The invention relates to machine welded obturators of generally spherical shape for equipping rotary plug valves. These obturators are composed of a central tube and an envelope formed by two hemispherical segments of pressed sheet metal which are truncated by two planes perpendicular to their diametral plane and which are welded on the one hand to one another in a diametral plane passing through the axis of the tube and through the axis of rotation and on the other hand, to two ends of the central tube, and at its outer surface, in a plane parallel to its diametral plane, each segment carries a sealing bearing or a seal in a groove.
Claims4
An obturator of generally spherical shape for a spherical rotary plug valve comprising:
- a tube having a longitudinal axis and two opposite ends defining a conduit passing through the obturator;
- an envelope of generally spherical shape having diametrically opposed openings formed therein and surrounding said tube, said envelope being welded at said openings therein to the ends of said tube;
- and means for driving said tube and said envelope in rotation about an axis perpendicular to the axis of the tube,
- said envelope including an outer surface having two diametrically opposed circular bearings thereon arranged on a diametrical axis extending perpendicular to the axis of rotation and to the axis of the tube, said bearings comprising metal annular surfaces machined with precision on said sheet material to follow a spherical surface and serve as a support for fluid-tight seals when the obturator is closed;
- the space between the tube and the envelope being filed with a material which is poured in this space then expanded and solidified in place by heating the spherical envelope, so that the latter is pre-stressed in tension after cooling.
Dependencies are inferred from the claim text.