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Butterfly valve and method of making same

  • US 4,380,246 A
  • Filed: 03/20/1981
  • Issued: 04/19/1983
  • Est. Priority Date: 03/20/1981
  • Status: Expired due to Fees
First Claim
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1. In a butterfly valve for controlling flow therethrough of a high temperature fluid, said valve comprisingan outer metal housing, a ceramic lining carried by said housing and defining a substantially right circular cylindrical fluid flow passage through said valve, a valve closure member which is a disc of substantially circular outline, a rotatable metal shaft embedded on a diametrical line of said disc, and means rotatably supporting said shaft on said housing to enable rotation of said member within said flow passage from an open to a closed position to open and close said flow passage, said member being made of a ceramic material and said shaft being embedded substantially centrally between opposed surfaces of said member,said member having a roughly cylindrical diametrical opening therethrough defining a corresponding cylindrical inside surface and further comprising a tubular metal sleeve disposed concentrically around said shaft, a key connecting said sleeve and shaft and preventing relative rotation therebetween, and a refractory material disposed between said sleeve and said inside surface fixing said member to said sleeve and shaft,said member having a plurality of angularly spaced rectilinear grooves extending radially from its inside surface and said refractory material having integral portions thereof disposed within said rectilinear grooves which help hold said member and refractory material together as a unitary structure,said lining being initially made independently of said housing and having an outside surface, a plurality of axially spaced grooves in said lining extending inwardly from said outside surface, and further comprising a thickness of refractory material disposed against said outside surface with portions thereof received within said axially spaced grooves, said portions of refractory material in said axially spaced grooves helping to hold said lining and refractory material together as a unitary structure ,a thermal insulating material disposed between said thickness of refractory material and said metal housing,two sets of aligned openings in said metal housing, thermal insulating material, refractory material, and ceramic lining at diametrically opposed positions on said valve;

  • said shaft having opposite end portions with each end portion extending through an associated set of aligned openings and outwardly of said metal housing; and

    a support and seal assembly for each of said end portions of said shaft, each assembly serving to support its shaft end portion while preventing leakage out of said valve of fluid flowing in said flow passage, anda tubular flange structure fixed at its inner end in sealed relation to said housing and having a planar outermost surface which is disposed perpendicular to a central longitudinal axis of said shaft, an annular groove in each of said shaft end portions, a snap ring disposed in each groove and having an outside diameter which is greater than the outside diameter of its shaft end portion thereby defining a corresponding annular portion thereof, each groove and snap ring having associated outer surfaces disposed substantially coplanar with said planar surface, a high temperature gasket covering said planar surface and said annular portion of said snap ring, said gasket having a central bore defining a right circular cylindrical surface disposed in sealed relation against the outside surface of its associated shaft end portion, an annular plate structure disposed axially outwardly of said gasket along its shaft end portion and having a gasket engaging surface sandwiching same against said planar surface, high temperature packing ring means disposed in sealed relation concentrically around and against the outside surface of its associated shaft end portion, and a spring assembly yieldingly urging said packing ring means in sealed relation against said annular plate structure.

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