Hollow cones produce the smallest droplet size of any purely hydraulic nozzle. The spiral grooves in the swirl inserts ensure an efficient rotation of the liquid, which creates uniform droplets in a ring pattern.
In the axial flow design, the rotary motion of the liquid is generated by the swirl insert or vane. The axial design produces the finest droplets even when compared to tangential. The tangential design contains no inserts and the liquid flows at a right angle, which creates a spiraling rotation inside the nozzle chamber. These nozzles are less prone to clogging.