Control and by-pass valve unit for 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 A RESERVOIR FOR STORING SUCH FLUIDS, PRESSURE SUPPLY MEANS FOR DELIVERING SAID FLUIDS AT A CERTAIN PRESSURE FALLING WITHIN A CERTAIN PREDETERMINED RANGE OF PUMPING PRESSURES, FLUID DISCHARGE MEANS, MEANS FOR EXTENDING BETWEEN SAID RESERVOIR AND SAID SAID FLUID DISCHARGE MEANS AND THE SURFACE BEING TREADED, CONDUIT MEANS EXTENDING BETWEEN SAID RESERVOIR AND SAID FLUID DISCHARGE MEANS, AND PRESSURE CONTROL VALVE MEANS DISPOSE ALONG THE SAID CONDUIT FOR CONTROLLING THE PRESSURE IN THE DISCHARGE OF SAID FLUID; SAID PRESSURE CONTROL VALVE MEANS INCLUDING A BODY WITH AN INLET AND AN OUTLET AND HAVING A PASSAGEWAY THEREIN, AN ORIFICE PLATE DISPOSED ADJACENT TO SAID PASSAGEWAY AND MOVABLE RELATIVE THERETO, SELECTOR MEANS COUPLED WITH SAID ORIFICE PLATE FOR POSITIONING SAID PLATE TO ADJUST THE SIZE OF THE APERTURE FORMED BY SAID ORIFICE PLATE ALONG SAID PASSAGEWAY, A BY-PASS VALVE MEANS RESPONSIVE TO THE SPEED OF SAID VEHICLE, SAID BY-PASS VALVE MEANS ADAPTED TO CONTROL THE FLOW OF FLUIDS THERETHROUGH AND BEING ARRANGED FOR RECIPROCAL OPENING AND CLOSING MOTION, THE OPENING MOTION THEREOF BEING OPPOSED BY CERTAIN PRESSURE CHAMBER, SAID SPEED RESPONSIVE MEANS BEING ADAPTED TO SENSE THE SPEED OF SAID VEHICLE AND BEING COUPLED WITH SAID CERTAIN PRESSURE CHAMBER, SAID SPEED RESPONSIVE MEANS HAVING A FLOW CONTROL MEANS ADAPTED TO MAINTAIN THE PRESSURE IN CERTAIN PRESSURE CHAMBER AT A LEVEL POROPORTIONAL TO THE SQUARE OF THE SPEED OF SAID VEHICLE.