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Flow-operated valve

  • US 6,533,037 B2
  • Filed: 11/29/2000
  • Issued: 03/18/2003
  • Est. Priority Date: 11/29/2000
  • Status: Expired due to Term
First Claim
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1. A tool for use in a wellbore, comprising:

  • a sealing assembly to define a first zone;

    a valve; and

    a valve operator responsive to fluid flow to actuate the valve from an open to a closed position, wherein the valve operator comprises a plurality of flow restrictors and wherein at least one of the flow restrictors controls fluid free fall rate through the valve to prevent inadvertent activation of the valve.

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