Atomization caused by release of high pressure fluid that impinges through small orifice. Most widely used by painting contractors, structural metal finishers, and heavy equipment manufacturers.
Advantages: High fluid capability. Large patterns. Fastest spray application process. Low air consumption. Limited fog and “bounce back” – permits spraying into cavities.
Limitations: Potentially hazardous hydraulic injection. Higher rate of overspray due to high fluid output. Sharp patterns; difficult to blend. Expensive nozzles (tips). Coarse atomization may flood surface or create runs. Equipment requires top maintenance.
Directs fluid under high pressure through a controlled orifice to accomplish airless atomization. Ideal for quickly applying high volumes of coatings to large surfaces. Most often used to apply protective, rather than decorative coatings.