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Valve assembly having improved conductance control

  • US 20050067603A1
  • Filed: 09/29/2003
  • Published: 03/31/2005
  • Est. Priority Date: 09/29/2003
  • Status: Active Grant
First Claim
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1. A valve assembly comprising:

  • a housing having a flow channel and an annular surface surrounding the flow channel;

    a slide plate located in the housing and movable transversely to an axis of the flow channel between a closed position, in which the slide plate blocks flow through the flow channel, and an opened position, in which the slide plate allows flow through the flow channel; and

    a seal ring positioned between the annular surface of the housing and the slide plate;

    wherein at least one of the slide plate and the seal ring includes at least one passageway for increasing conductance between the slide plate and the seal ring.

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