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Air control valve for exhaust gas purifying apparatus

  • US 4,009,986 A
  • Filed: 05/12/1975
  • Issued: 03/01/1977
  • Est. Priority Date: 01/14/1972
  • Status: Expired due to Term
First Claim
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1. In combination, a heating burner for heating a reactor of an exhaust gas purifying apparatus to operating temperatures, fuel supply means for delivering burner fuel to said heating burner, said fuel supply means including a fuel conduit, air supply means for delivering combustion air to said heating burner, said air supply means including a burner air conduit and an air pump disposed in the latter, and an air control valve, the air control valve including:

  • a. a movable valve member situated in said burner air conduit downstream of said air pump; and

    b. regulating means coupling to said movable valve member for regulating the air quantities delivered to said heating burner to a constant value independently from the counterpressure at said heating burner and independently from the output delivery of said air pump, said regulating means including;

    i. venturi nozzle disposed in said burner air conduit upstream of said movable valve member, said venturi nozzle having a narrowest flow passage section;

    ii. a diaphragm having first and second sides;

    iii. linkage means connecting said diaphragm with said movable valve member;

    iv. means for communicating the pressure prevailing in said narrowest flow passage section with said first side of said diaphragm;

    v. a spring means in engagement with said first side of said diaphragm; and

    vi. means for communicating the pressure prevailing in said burner air conduit downstream of said venturi nozzle and upstream of said movable

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