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Liquid flow controller and precision dispense apparatus and system

  • US 20050173003A1
  • Filed: 07/18/2003
  • Published: 08/11/2005
  • Est. Priority Date: 07/19/2002
  • Status: Active Grant
First Claim
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1. Fluid flow control apparatus, comprising:

  • a proportional fluid control valve having a fluid inlet and a fluid outlet;

    a pneumatic proportional control valve in communication with said proportional fluid control valve for modulating said proportional fluid control valve;

    a frictional flow element having a frictional flow element fluid inlet in fluid communication with said fluid outlet of said proportional fluid control valve and having a frictional flow element fluid outlet spaced from said frictional flow element fluid inlet, said frictional flow element creating a pressure drop between said frictional flow element fluid inlet and frictional flow element fluid outlet;

    means for measuring said pressure drop;

    a controller in communication with said pressure drop measuring means and with said pneumatic proportional control valve for controlling the flow of fluid through said proportional fluid control valve in response to said measured pressure drop.

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