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Low recovery rotary control valve

  • US 5,070,909 A
  • Filed: 06/11/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 06/11/1990
  • Status: Expired due to Term
First Claim
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1. A rotary control valve for controlling fluid flow through a conduit comprising:

  • a plug element rotatable in the conduit having a plurality of ducts extending through the plug from a first face to a second face and at least one transverse duct communicating between at least two of the plurality of ducts, the transverse duct and the said two ducts defining fluid flow paths therethrough, the average cross sectional area of the flow path of the transverse duct being less than the average cross sectional area of the flow paths of the said two ducts;

    a first trim element located in the conduit abutting the plug, having a plurality of ducts extending from an outside face to an inside face, the inside face being dimensioned to closely conform to the first face of the plug; and

    wherein the location and dimension of the ducts on the inside trim face coincide with the location and dimension of the ducts on the first plug face.

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