Water mist nozzles can be classified according to their atomization principle into centrifugal atomization type water mist nozzles (Type A and Type B) and impact type water mist nozzles (Type C). Type A water mist nozzles have an inlet and outlet at a 90° angle, allowing for adjustment of the water flow direction within a certain range after installation. Type B water mist nozzles have an outlet and inlet on a straight line, and are completely fixed and non-adjustable after installation. Impact type water mist nozzles disperse pressurized water into a uniform cone-shaped mist within a designated area by impacting an external splash plate.
Based on their opening and closing mechanism, water mist nozzles are available in open and closed types.
Based on pressure, for example, high-pressure fine water mist nozzles operate at pressures ranging from 10 to 14 MPa, producing a Class I fine water mist with a droplet diameter Dv of 0.5 μm. The operating pressure of a water mist nozzle used for fire suppression should not be less than 0.35 MPa.
