Patent ID: 6409375
Filing Date: 2002-06-25
Classification: A01M,B05B

Abstract:
Spray apparatus of the kind in which chemical to be sprayed is injected into spray liquid before the mixture of liquid and chemical is sprayed, comprising a closed loop circulating system having a pump with an inlet and an outlet, a loop line connecting the pump inlet and outlet, a spray nozzle connected to the loop line downstream of the pump via a spray line, a spray liquid inlet connected to the loop line upstream of the pump and downstream of the spray liquid inlet, a chemical injection system connected to the loop line upstream of the pump, a venturi device having an inlet and an outlet in the loop line, and having a suction or side port, a return line connected to the spray line at a position adjacent to the spray nozzle and connected to the suction port of the venturi device, an agitation line connected between the loop line downstream of the venturi device and the spray line adjacent the spray nozzle and valve means in the spray line directing liquid flow to the spray nozzle to cause reverse flow through the agitation line past the spray nozzle and through the return line.