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Method and apparatus for metering a fluid

  • US 5,834,314 A
  • Filed: 08/06/1997
  • Issued: 11/10/1998
  • Est. Priority Date: 11/07/1994
  • Status: Expired due to Term
First Claim
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1. A method for metering a first fluid, the method comprising the steps of:

  • (a) fluidly connecting a source of first fluid to be metered with a pressure source capable of moving the first fluid, the source of first fluid being fluidly connected with the pressure source by a first valve and a conduit;

    (b) operating the first valve such that the first fluid moves in the conduit;

    (c) operating the first valve so that the first valve defines a first end of a metered volume in a first portion of the conduit;

    (d) fluidly connecting the pressure source with a source of second fluid that has a fluid flow rate greater than the first fluid with a second valve and a second portion of the conduit; and

    (e) operating the second valve such that the second fluid moves into the second portion of the conduit simultaneously with movement of the first fluid in the second portion of the conduit to provide said metered volume of the first fluid in the first portion of the conduit with the second valve defining an end of the metered volume of the first fluid in the first portion of the conduit, the metered volume being contained in the first portion of the conduit between the first and second valves.

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