The spray impact, i.e. the effect a jet exerts upon a surface, is defined in various ways. For assessing the efficiency of spray nozzles, the spray impact definition N/mm2 (impact), commonly used now, proved especially reliable. This is the conversion of the total spray force into the impact force acting upon the impacted area.
Low spray pressures are generated by full cone nozzles of wide-angle flat fan nozzles.
High spray pressures are typical for flat fan nozzles with narrow spray angles (15°-60°).
Extremely high spray pressures are produced by solid stream nozzles.