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Apparatus for preventing thermal damage to a preformed plug during molding of a housing therearound

  • US 4,488,573 A
  • Filed: 07/13/1983
  • Issued: 12/18/1984
  • Est. Priority Date: 10/23/1981
  • Status: Expired due to Fees
First Claim
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1. A ball valve assembly suitable for use in a molding operation wherein molten polymeric material is introduced into a mold cavity around said ball assembly to produce a formed-in-place housing around said ball assembly, said ball assembly including a bore which is rotatably alignable with a through-passage of the housing to admit a flow of fluid, the improvement wherein said ball assembly includes a ball element of a polymer, said bore being formed in said ball element, and a shield of a polymeric material is attached to said ball element by a snap-lock fit which maintains an inner spherical surface of said shield against a correspondingly shaped outer spherical surface of said ball.

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