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Apparatus and method of preventing ice accumulation on coupling valves for cryogenic fluids

  • US 5,301,723 A
  • Filed: 11/06/1992
  • Issued: 04/12/1994
  • Est. Priority Date: 11/06/1992
  • Status: Expired due to Term
First Claim
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1. A quick-disconnect coupling for use in a cryogenic system having mating components for establishing a connection between two lines for transferring cryogenic fluid from one line to the other without ice forming on mating surfaces of the components, the quick-disconnect coupling comprising:

  • a first connector coupled to a first line and having a first mating surface;

    a second connector coupled to a second line for carrying a flow of cryogenic fluid, the second connector having a second mating surface configured for mating with the first connector and establishing a disconnectable seal for communication of the flow of cryogenic fluid from the second line to the first line;

    the second connector including a passage for supplying a flow of dry purging gas to the second mating surface for displacing moisture-laden air from around the second mating surface, thereby preventing moisture in air from freezing onto the second mating surface when the second connector is very cold due to flow of cryogenic fluid.

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