Crack resistant valve plate assembly for a molten metal...

B - Operations – Transporting – 22 – D

Patent

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Details

B22D 41/28 (2006.01)

Patent

CA 2227535

A crack resistant valve plate assembly is provided for use in a slide gate valve. The valve plate assembly includes a refractory valve plate having an orifice (19) positioned along its longitudinal center line (70), and truncated corners (54 a,b,c,d) for focusing a clamping force toward the center line in the vicinity of the orifice to prevent the formation and spreading of cracks. The angular orientation of each of the truncated corners varies with respect to the position of the orifice along the longitudinal center line. Specifically, each of the truncated comers are orthogonal to a line (78 a,b,c,d) extending from a point tangent with the orifice, across the center line, and through an intersection of lines (72 a,b,c,d) drawn parallel to the converging lengthwise and widthwise plate edges that is spaced from the edges a distance equal to one half of the maximum diameter of orifice that the plate can effectively operate with.

L'invention concerne un ensemble plaque porte-soupape résistant aux fissures pouvant être utilisé dans une vanne à glissière. L'ensemble plaque porte-soupape comprend une plaque réfractaire comportant un orifice (19) positionné le long de son axe central longitudinal (70), et des coins tronqués (54a, b, c, d) assurant la focalisation d'une force de fermeture sur la ligne centrale à proximité de l'orifice, de façon à empêcher la formation et l'extension des fissures. L'orientation angulaire de chacun des coins tronqués varie par rapport à la position de l'orifice le long de l'axe longitudinal. Spécifiquement, chaque coin tronqué est perpendiculaire par rapport à une ligne (78a, b, c, d) partant d'un point tangent à l'orifice, coupant la ligne centrale et passant par une intersection de lignes (72a, b, c, d) tracées parallèlement aux bords longitudinaux et transversaux convergents de la plaque, et située à une distance des bords égale à la moitié du diamètre maximum de l'orifice avec lequel la plaque peut effectivement fonctionner.

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