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Stepped butterfly valve

  • US 20030122100A1
  • Filed: 01/02/2002
  • Published: 07/03/2003
  • Est. Priority Date: 01/02/2002
  • Status: Active Grant
First Claim
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1. A disk for controlling fluid flow inside a valve having an upstream side and a downstream side, the disk comprising:

  • a first vane having a sealing surface; and

    a second vane disposed relative to the first vane, the second vane having a fluid obstructing surface forcing fluid to flow across the second vane when in a partially open position.

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