US Patent 8636232 Method for spraying a medium and spraying nozzle

A method for spraying a medium mist, particularly a medium mist used in firefighting, over a large area. In the method, at least two sprays of medium mist are formed, of which a first spray is within a second medium mist spray at least at or near the spraying point. During the formation of the sprays, the medium is set into a swirling motion at least before the discharge opening of the nozzle used to form each spray and/or at least before the sprays are mixed with each other. The swirling directions of the medium in different sprays are opposite to each other, whereby a preferably homogeneous mist spray spread over a large area is achieved.