Patent ID: 8453945

Claim:
A method of operating a spray nozzle comprising the steps of: providing a spray nozzle comprising a mixing chamber and at least two through bores leading to the mixing chamber, each through bore being connected to a fluid line, at least one of the through bores being formed for a self-cleaning process and/or devices are provided for cleaning at least one of the through bores; providing a pressurized gas supply line leading to the mixing chamber as one of the fluid lines upstream of one of the through bores formed as a pressurized gas inlet bore; providing a liquid supply line leading to the mixing chamber as one of the fluid lines; introducing a cleaning fluid into the pressurized gas supply line; introducing a cleaning fluid into the liquid supply line; and further including introducing foam particles upstream of the pressurized gas inlet bore and pressing the foam particles through the pressurized gas inlet bore under the pressure of a pressurized gas.