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Transfer system

  • US 4,253,501 A
  • Filed: 11/09/1979
  • Issued: 03/03/1981
  • Est. Priority Date: 11/09/1979
  • Status: Expired due to Term
First Claim
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1. A transfer device for the withdrawal of aliquots from a container of bulk solution comprising:

  • body means having;

    first walls defining a tapered chamber;

    second walls defining a first passage venting the smaller end of said chamber to the surrounding air;

    third walls defining a second passage communicating at one end with the larger end of said chamber; and

    fourth walls defining a third passage having one end for withdrawal of fluid therefrom, said third passage being free of communication with said first and second passages and said chamber within said body means;

    a tapered valve element received within said chamber for movement between first and second conditions in response to changes in the pressure differential between the first and second passages, said first condition providing a fluid seal between the first and second passages by engagement of said valve element with said first walls of the chamber for pressures within the second passage greater than that within the first passage, and said second condition providing a fluid path from the first passage to the second passage for pressures within the second passage less than that within the first passage; and

    means for placing the other ends of said second and third passages in communication with the interior of the container of bulk solution;

    whereby a path is provided for air to be drawn into the container through the first and second passages when aliquots are withdrawn from the container through the third passage, but fluid is not able to escape from the container through the first and second passages.

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