PA PB hollow cone nozzle generates a hollow cone spray pattern of finely atomized droplets and works on the tangential flow principle. They are designed with a tangential method of atomization. Inside these nozzles there is an axial groove that injects the liquid tangentially into the vortex chamber where the strong centrifugal force produces a high rotational velocity and generates a finely atomized liquid flow. As these nozzles have a large free passage inside and no swirl insert, they offer the maximum resistance to clogging. PA / PB nozzles are widely used in exhaust scrubbers and are suitable to spray flows with particles.