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Fig. 7.2: Paint spray gun with paint tank | Paint applied by a spray gun must be even and not drip. The nozzles of spray guns are therefore designed for an expanding, non-turbulent volume flow with a high exit speed. The consequence is high consumption of compressed air, well above that of cylindrical nozzles.
The consistency and desired quantity of paint to be applied determines the operating pressure and the nozzle diameter of the spray gun. These two values considerably influence the compressed air requirement.
With paint spray guns, a distinction is made between flat, broad and round spray nozzles. The type of spray influences the application of paint. There is also a difference in the compressed air requirement. On many spray guns it is possible to switch the types of spray.
The following table gives reference values for the compressed air consumption of spray paint nozzles depending on operating pressure, nozzle diameter and type of spray:
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