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Ball valve and methods of fabrication

  • US 4,883,253 A
  • Filed: 02/19/1986
  • Issued: 11/28/1989
  • Est. Priority Date: 12/16/1982
  • Status: Expired due to Fees
First Claim
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1. A ball valve comprising:

  • a generally spherically shaped ball having a shaft integrally attached to one side thereof, a flow passage being formed through said ball, a recessed surface being formed around said flow passage on either side of said ball extending inwardly beyond the spherical surface of said ball;

    a valve body made of a synthetic resin, said valve body having a flow passage extending longitudinally therethrough and provided with connecting means at outer ends of said flow passage in said valve body;

    a generally annularly shaped ball seat fixed to said valve body at a position surrounding said flow passage in said valve body, said ball seat having an inner generally annularly shaped lip extending into a recess defined by said recessed surface of said ball when said ball is in an open position without contacting said ball and in close contact with said ball to thereby bring said lip into sealing engagement with said ball when said ball is in a closed position irrespective of the flow pressure of the flow passage.

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