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Proportioning valve and control means therefor

  • US 6,129,106 A
  • Filed: 05/27/1998
  • Issued: 10/10/2000
  • Est. Priority Date: 07/16/1996
  • Status: Expired due to Fees
First Claim
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1. A closed loop control system for controlling the mixture of a first liquid with a second liquid to produce a liquidous mixture having a desired proportion of the first liquid to the second liquid, the closed loop control system comprising:

  • a) a first supply means for supplying a first liquid;

    b) a second supply means for supplying a second liquid;

    c) a proportioning valve mean having a valve body, a first inlet for receiving said first liquid, a second inlet for receiving said second liquid and an outlet for expelling an output now of a third liquid comprised of a mixture of said first liquid and said second liquid, said proportioning valve apparatus further including;

    i) a valve body having a first inlet, a second inlet and an outlet;

    ii) a rotary shaft ratably held by said valve body; and

    iii) a rotary valve barrier disposed in said housing and affixed to said rotary shaft, said rotary valve barrier configured to selectively close said first and second inlets, rotation of said rotary valve barrier in a first direction being operative to close said first inlet while simultaneously opening said second inlet, rotation of said rotary valve barrier in a second direction being operative to open said first inlet while simultaneously closing said second inlet;

    d) a first conduit for communicating said liquid between said first supply means and said first inlet;

    e) a second conduit for communicating said second liquid between said second supply means and said second inlet;

    f) a valve control means for controlling the rate of flow of said first liquid through said first inlet and for controlling the rate of flow of said second liquid through said second inlet;

    g) a density measurement means for measuring the density of said liquidous output flow;

    h) a signal means coupled to said density measurement means for producing signals representative of the density of said output flow; and

    i) a processing means coupled with said signal means and said valve control means for receiving said signals and responsive thereto for controlling the rate of flow of said first liquid through said first inlet and for controlling the rate of flow of said second liquid through said second inlet to produce said output mixture having a desired proportion or said first liquid to said second liquid.

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