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

• Current Assignee: Dayco Europe Srl (Park-Ohio Holdings Corporation)
• Original Assignee: Dayco Europe Srl (Park-Ohio Holdings Corporation)
• Inventors: Casale, Thomas M., Schmitz, Frederick J. Jr., Pauperas, Victor
• Primary Examiner(s): Schwadron, Martin P.
• Assistant Examiner(s): Shay, James R.
• Application Number:
  US06/245,844
• Time in Patent Office: 760 Days
• Field of Search: 251/214, 251/308, 137/375, 137/340
• US Class Current: 137/375
• CPC Class Codes: F16K 1/22 with axis of rotation crossing the valve member, e.g. butterfly valves
• CPC Class Codes: F16K 27/0218 Butterfly valves
• CPC Class Codes: Y10T 137/6579 Circulating fluid in heat exchange relationship
• CPC Class Codes: Y10T 137/7036 Jacketed

Abstract

A butterfly valve for controlling flow therethrough of a high temperature fluid and method of making same are provided wherein such valve comprises an outer metal housing, a ceramic lining carried by the housing and defining a fluid flow passage through the valve, a valve closure member, a rotatable shaft fixed to the member, and means rotatably supporting the shaft on the housing to enable rotation of the member within the flow passage from an open to a closed position to open and close the flow passage, and wherein the member is made of a ceramic material and the shaft is embedded substantially centrally between opposed surfaces of the member.

Claims

1. In a butterfly valve for controlling flow therethrough of a high temperature fluid, said valve comprising

an 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, and

a 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.

2. A valve as set forth in claim 1 in which said annular plate structure has a tube extending outwardly in sealed relation from the side thereof opposite its gasket engaging surface;

said tube being disposed concentrically around its shaft end portion and having a sealing end edge; and

said spring assembly comprises;

an urging disc having a central bore therethrough slightly larger in diameter than the outside diameter of its shaft end portion;

a support sleeve fixed to said urging disc;

said support sleeve having an inside diameter which is larger than the outside diameter of said tube whereby an end portion of said tube is received within said sleeve with said packing ring means confined by said sleeve, shaft end portion, urging disc, and sealing end edge of said tube; and

a plurality of springs yieldingly urging said urging disc and hence said packing ring means in sealed engagement against said sealing end edge.

3. A valve as set forth in claim 2 in which said springs comprise mechanical compression springs.