Flow control is essential for accurate, consistent applications of pesticides. Two constant flow valves, the CFValve and the SMV, were retrofitted to a knapsack sprayer and the spray equipment was used to control weeds in oil palm grown in Malaysia. Visual evaluations of weed control as well as assessments of spray deposition and worker exposure were compared for each sprayer configuration. Deposition of spray and the resulting weed control was more efficient with equipment that included the flow control valves. These equipment configurations also significantly reduced the amount of spray solution found on the thigh of the applicator when compared to the standard equipment.