Spray apparatus

Claim 1

A SPRAY APPARATUS FOR FORMING A COMPOSITE SPRAY OF GAS-PROPLLED LIQUID GLOBULES AND SOLID PARTICLES COMPRISING A FIRST NOZZLE, SUPPLY MEANS FOR SUPPLYING A PRESSURIZED GAS TO SAID FIRST NOZZLE, MEANS FOR SUPPLYING A LIQUID TO SAID FIRST NOZZLE IN A MANNER TO EFFECT ATOMIZATION THEREOF AND DISCHARG FROM SAID FIRST NOZZLE IN THE FORM OF A GAS-PROPELLED SPRAY OF FINE-SIZED LIQUID GLOBULES, A SECOND NOZZLE, MEANS FOR SUPPLYING A FINELY-PARTICULATED SOLID POWDER INCLUDING GAS-ACTUATED MEANS FOR FLUIDIZING AND DISCHARGING SAID POWDER AT A CONTROLLED RATE TO SAID SECOND NOZZLE INTO SAID SPRAY FROM SAID FIRST NOZZLE EFFECT ING ENTRAINMENT OF SAID POWDER IN SAID SPRAY, A CONDUIT CONNECTED TO SAID GAS-ACTUATED MEANS AND TO SAID SUPPLY MEANS, AN ORIFICE IN SAID SUPPLY MEANS, SENSING MEANS FOR SENSING THE PRESSURE DROP ACROSS SAID ORIFICE IN RESPONSE TO THE FLOW OF GAS THERETHROUGH TO SAID FIRST NOZZLE, FIRST VALVE MEANS IN SAID CONDUIT OPERATIVELY ASSOCIATED WITH SAID SENSING MEANS AND MOVABLE TO AN OPEN POSITION WHEN A PRESELECTED PRESSURE DROP IS EXCEEDED ENABLING PASSAGE OF GAS TO SAID GAS-ACTUATED MEANS AND MOVABLE TO A CLOSED POSITION PREVENTING PASSAGE OF GAS TO SAID GASACTUATED MEANS WHEN THE PRESSURE DROP IS BELOW THE PRESELECTED LEVEL, AND SECOND VALVE MEANS FOR CONTROLLING THE RATE OF FLOW OF GAS TO SAID FIRST NOZZLE.