Injection spray system with adjustable metering valve

  • US 6,182,911 B1
  • Filed: 07/01/1999
  • Issued: 02/06/2001
  • Est. Priority Date: 07/02/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A metering valve configured to mix a first fluid with a second fluid, the metering valve comprising:

  • (a) a valve body bounding a mixing chamber and having;

    (i) an inlet passageway extending from the exterior to the mixing chamber, the inlet passageway being configured to deliver the first fluid the mixing chamber under pressure;

    (ii) a discharge passageway extending from the mixing chamber to the exterior;

    (iii) a stem compartment in fluid communication with the mixing chamber through a control orifice;

    (iv) a transition passageway in fluid communication with the stem compartment, the transition passageway being configured to deliver the second fluid to the mixing chamber through the control orifice; and

    (v) a stationary alignment mark located on an exterior surface thereof;

    (b) a metering stem movably disposed within the stem compartment, the metering stem being configured to selectively control the flow of the second fluid from the transition passageway to the mixing chamber by selectively advancing and retracting within the stem compartment; and

    (c) an adjustment knob having a side face with a plurality of spaced apart indicia identifying discrete ratios of the first fluid to the second fluid, the adjustment knob being coupled with the metering stem such that alignment of a select indicia chosen from the plurality of indicia with the stationary alignment mark displaces the metering stem relative to the control orifice so that the first fluid and the second fluid feed into the mixing chamber at the ratio identified by the select indicia, the adjustment knob having a substantially cylindrical configuration with the side face encircling the adjustment knob and longitudinally extending between a first end to an opposing second end, the indica being disposed on the side face adjacent to the first end so as to at least partially encircle the adjustment knob at spaced apart locations, the adjustment knob further including (i) a first metering mark disposed on the side face of the adjustment knob between a first select one of the indicia and the first end of the adjustment knob; and

    (ii) a second metering mark disposed on the side face of the adjustment knob between a second select one of the indicia and the second end of the adjustment knob, the second alignment mark identifying a ratio of the first fluid and the second fluid after at least one full rotation of the adjustment knob.

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