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Reductant delivery apparatus with purging means

  • US 8,931,259 B2
  • Filed: 09/02/2012
  • Issued: 01/13/2015
  • Est. Priority Date: 09/02/2011
  • Status: Active Grant
First Claim
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1. A dosing apparatus delivering reductant to an exhaust gas treatment system of an internal combustion engine, comprising:

  • a Venturi T connector with a first high pressure port, a second high pressure port, and a low pressure port, at which a low pressure is created when a fluid flows through said first high pressure port and said second high pressure port;

    a buffer chamber fluidly coupled to said low pressure port of said Venturi T connector;

    an injector fluidly coupled between said buffer chamber and an exhaust line for controlling reductant dosing rate;

    a pump fluidly coupled to said first high pressure port of said Venturi T connector for supplying reductant; and

    a control valve fluidly connected to said second high pressure port of said Venturi T connector for controlling a reductant flow passing therethrough.

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