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Method and apparatus for reducing free flow risk

  • US 20060182637A1
  • Filed: 02/16/2005
  • Published: 08/17/2006
  • Est. Priority Date: 02/16/2005
  • Status: Active Grant
First Claim
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1. A method for reducing a risk of external pressure induced free flow through a pump having an inlet and an outlet comprising:

  • sensing a pressure difference between an inlet pressure and an outlet pressure;

    mechanically communicating the pressure difference to a flow restricting element associated with the pump outlet; and

    increasing a resistance to flow exiting the pump outlet with the flow restricting element when the inlet pressure exceeds the outlet pressure.

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