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Fluid flow regulation

  • US 7,104,281 B2
  • Filed: 08/15/2003
  • Issued: 09/12/2006
  • Est. Priority Date: 08/15/2003
  • Status: Expired due to Fees
First Claim
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1. A system for fluid flow regulation, the system comprising:

  • a first flow throttling device comprising a first flow throttling area; and

    a second flow throttling device operable to move within the first flow throttling device to facilitate flow regulation, the second flow throttling device comprising a second flow throttling area that restricts flow more than the first flow throttling area, the second flow throttling area primarily regulating flow when the second flow throttling device is beginning to allow flow, and the first flow throttling area primarily regulating flow when the second flow throttling device is close to allowing full flow;

    wherein the first flow throttling area includes a plurality of windows, the windows tapering from a broad first end to a narrower second end, the windows oriented such that the first broad end is proximate the second throttling area when the second flow throttling device is beginning to allow flow.

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