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Control system for temperature compensated vapor recovery in gasoline dispenser

  • US 5,156,199 A
  • Filed: 01/21/1992
  • Issued: 10/20/1992
  • Est. Priority Date: 12/11/1990
  • Status: Expired due to Term
First Claim
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1. A liquid delivery system, comprising:

  • a liquid delivery path adapted for engagement with a tank to be filled,means for delivering liquid to the tank along said liquid delivery path with a variable volumetric flow;

    means for providing and electrical signal indicative of said volumetric flow;

    a second path that is adjacent to said liquid delivery path;

    vapor recovery means responsive to said electrical signal for sucking vapor from the tank along said second path with a nominal volumetric flow corresponding to the volumetric flow;

    means for deriving second and third signals respectively representing the absolute temperatures of liquid in said liquid delivery path and vapor entering said second path; and

    means responsive to said second and third signals for increasing the volumetric flow of the vapor recovery means when the temperature of the liquid is greater than the temperature of vapor and for decreasing the volumetric flow to the vapor recovery means when the temperature of the liquid is less than the temperature of vapor.

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