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Float-type shut off device for a cryogenic storage tank

  • US 5,787,942 A
  • Filed: 06/14/1996
  • Issued: 08/04/1998
  • Est. Priority Date: 06/14/1996
  • Status: Expired due to Fees
First Claim
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1. A flow interrupt device for abruptly decreasing the flow of a liquid cryogen into a storage tank when liquid stored in the tank reaches a predetermined level, the device comprising:

  • a) an inlet conduit for conveying cryogenic liquid into the storage tank, the inlet conduit having at least one port for spraying liquid into the tank; and

    b) a float movably mounted concentrically about the conduit for movement between upper and lower positions and including;

    i) a gas compartment to provide buoyancy;

    ii) an impact surface dimensioned to be impinged upon by the spray to maintain the float submerged in the stored liquid until the liquid reaches said at least one port; and

    iii) means for defining a radial clearance passage of reduced volume between said inlet conduit and said float to restrict flow of cryogenic fluid into said tank when the float is in the upper position;

    whereby the force of the spray on the impact surface offsets the buoyant force of the float until the liquid level reaches the at least one port and thereafter the buoyant force causes the float to quickly move to the upper position.

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