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Method and apparatus for precision pumping, ratioing, and dispensing of work fluid(s)

  • US 5,100,699 A
  • Filed: 01/17/1990
  • Issued: 03/31/1992
  • Est. Priority Date: 08/24/1989
  • Status: Expired due to Fees
First Claim
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1. The method of precision dispensing a degassed liquid onto a workpiece comprising:

  • a) delivering a non-degassed first work liquid to a first chamber maintained at below atmospheric pressure where said first work liquid is agitated to cause substantially all gases therwithin to be removed therefrom and from said first chamber,b) removing the substantially degassed first work liquid from said first chamber by a means which creates and maintains a positive hydraulic pressure which is above atmospheric pressure on said first work liquid for moving same through substantially sealed passageways to a dispensing outlet after routing through positive displacement precision programmable dispensing pump means in said substantially sealed passageways;

    c) actuating the programmable precision pump means to cause a measured amount of said first work liquid to continue to move under a positive hydraulic pressure above atmospheric pressure for delivery of the said first work liquid through said dispensing outlet onto a workpiece;

    whereby the maintaining of the first work liquid at a hydraulic pressure above atmospheric pressure intermediate the first vacuum chamber and said dispensing outlet prevents entrainment of deleterious gases in the said first work liquid as it moves therebetween while affording precision dispensing.

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