Patent ID: 6345773
Filing Date: 2002-02-12
Classification: B05B

Abstract:
An aspiration-type sprayer for use with a liquid chemical, the sprayer comprising:(a) a sprayer head including (i) a carrier channel having an inlet for receiving a pressurized carrier fluid, an outlet through which the carrier fluid exits, and an expansion chamber in between the inlet and outlet, (ii) a chemical supply channel in flow communication with the expansion chamber of the carrier channel through an aspiration opening, so that a flow of carrier fluid through the carrier channel produces an aspiration flow from the chemical supply channel into the expansion chamber through the aspiration opening, the chemical supply channel having a free end for submersion in the liquid chemical, and (iii) a bleed line positioned upstream of the aspiration opening, the bleed line extending from the chemical supply channel between the aspiration opening and the liquid chemical, the bleed line connecting the chemical supply channel in flow communication to ambient air; and (b) a control valve assembly seated in the sprayer head to simultaneously engage the carrier channel and the bleed line, the control valve assembly being movable relative to the sprayer head to (i) selectively open and close the carrier channel to selectively permit the carrier fluid to flow therethrough, and (ii) with the carrier channel open, selectively open and close the bleed line to selectively permit ambient air to be drawn into the chemical supply channel in response to the aspiration flow produced by the flow of carrier fluid.