Control unit in combination with area spray system

Claim 1

IN A FLUID DISCHARGE SYSTEM ADAPTED TO DISPENSE FLUIDS OVER A SURFACE TO BE TREATED AT A SUBSTANTIALLY UNIFORM RATE OF COVERAGE AND HAVING MEANS FOR SUPPORTING A RESERVOIR FOR STORING SAID FLUID, MEANS FOR MAINTAINING FLUID LEAVING SAID RESERVOIR UNDER A CERTAIN PREDETERMINED PRESSURE, FLUID DISCHARGE MEANS, FLUID COUPLING MEANS EXTENDING BETWEEN SAID RESERVOIR AND SAID FLUID DISCHARGE MEANS, AND VALVE MEANS DISPOSED ALONG THE SAID COUPLING MEANS FOR METERING THE RATE OF DISCHARGE OF SAID FLUID; SAID VALVE MEANS INCLUDING A BODY HAVING A PASSAGEWAY THEREIN, FIRST AND SECOND RELATIVELY MOVABLE MUTUALLY ADJACENT ORIFICE MEANS COUPLED TO SAID VALVE AND SAID PASSAGEWAY, EACH HAVING BAFFLE MEANS ARRANGED TO IMPEDE THE FLOW OF FLUIDS THROUGH SAID PASSAGEWAY, SELECTOR MEANS COUPLED WITH SAID FIRST ORIFICE MEANS FOR POSITIONING SAID LAST MENTIONED MEANS TO ESTABLISH A CERTAIN PREDETERMINED EXTENT OF BAFFLE ALONG SAID PASSAGEWAY, SPEED RESPONSIVE MEANS SENSING THE RELATIVE SPEED FOR MOVEMENT BETWEEN SAID DISCHARGE MEANS AND THE SURFACE BEING TREATED AND BEING COUPLED WITH SAID SECOND ORIFICE MEANS FOR POSITIONING SAID SECOND ORIFICE MEANS TO ADJUST THE EXTENT OF BAFFLE OF SAID SECOND ORIFICE MEANS ALONG THE OPENING DEFINED BY SAID FIRST ORIFICE MEANS.