Even at pressure of 60 to 80 psi, the remaining venturi nozzles still provide excellent drift protection. Using lower than the recommended pressures may cause the pattern to collapse, and will reduce the activity of the air-induction mechanism. Without the inclusion of air in the droplets, the ability to maintain proper coverage can be reduced. Check the boom pressure of your sprayer and the ability of your pump to operate at high pressures. When using an automatic flow regulator, monitor your boom pressure and sprayer output closely when you change speeds.
Poor patterns are the number one reason for performance complaints.
For example, if you currently use a conventional 02 size nozzle at 40 psi, a venturi 015 tip operated at 70 psi will provide the same flow rate, drift less, and give you some pressure latitude if you need to slow down. If you use a 03 tip at 40 psi, conversion to a 025 nozzle at 60 psi, or a 02 nozzle at 90 psi will give the same flow rate. The smallest size for most venturi nozzles is 015, except for the Greenleaf TurboDrop and TurboDrop XL, which come in sizes as small as 005 and 01. Check manufacturer guidelines for recommended pressures, and calibrate your sprayer at the start of every season. Although venturi nozzles are sold as 110 degree fan angles, their spray pattern is closer to 80 degrees, and quickly becomes narrower at lower pressures.