The Venturi principle, or how does the powder injector work
The diagram below shows a cross section through a WAGNER powder injector: The functional principle Compressed air from the feed air connection is pushed through the injector nozzle (also known as the Venturi nozzle) into the collector nozzle. The small diameter of the nozzle ensures a high air velocity. On its way through the injector the feed air passes across the powder suction tube where it sucks in powder due to the vacuum. The air and the powder now continue to flow at a high velocity through the collector nozzle into the powder hose and finally to the spray gun. Good to know: The powder particles must be delivered at a speed of around 12 m/sec in order to achieve a uniform powder delivery and a soft cloud.