Method and apparatus for reducing free flow risk
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United States of America Patent
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Dec 8, 2009
Grant Date -
Aug 17, 2006
app pub date -
Feb 16, 2005
filing date -
Feb 16, 2005
priority date (Note) -
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Abstract
A technique for reducing the risk of free flow through a pump is disclosed. The technique includes sensing a pressure difference between the pump inlet and outlet. The pressure difference is mechanically communicated to a flow restricting element. The flow restricting element increases resistance to flow exiting the pump outlet in a relation to the pressure difference present between the pump inlet and pump outlet.
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