RA hollow cone nozzle is a tangential nozzle that produce a finely atomized spray in line with the inlet supply pipe. In their body there is a carefully machined swirl vane with two spiral grooves which produce a wide range of capacities, starting from very low values. The strong centrifugal force inside the vortex chamber creates a high speed rotation of the liquid flow producing an atomized mist. For small capacity RA hollow cone nozzle we suggest to place a suitable filter before their inlet orifice to avoid clogging.