Water mist nozzles are specialized devices in automatic sprinkler systems that use water pressure to break down water flow into micron-sized droplets. Atomization methods include centrifugal atomization (Type A, Type B) and impingement atomization (Type C). The core parameter, the atomization angle, is represented by the apex angle of the water mist diffusion cone. The model coding system uses class, group, characteristic code, and specification parameters for classification and identification. For example, ZSTWA-50-120 represents a Type A nozzle with a flow rate of 50 L/min and an atomization angle of 120°. The recommended operating pressure for water mist nozzles is 0.35~0.7 MPa for fire suppression and 0.25~0.5 MPa for protective cooling.
In the evolution of water mist nozzle technology, early constant-pressure spray types used pressure threshold control to open and close, solving the problem of pipeline contamination, achieving atomized particle size of up to 400 μm. Subsequent improvements, such as anti-drip nozzles, employ a pre-tightened spring sealing structure to eliminate initial dripping, making them suitable for the protection of high-voltage power equipment. High-pressure closed-type sprinklers incorporate a temperature-sensing glass bulb triggering mechanism, producing atomized particles smaller than 120μm, suitable for fire protection requirements in special locations. Rotary sprinklers achieve 360° spraying through eccentric reaction force, combining fire control and radar signature elimination functions. They are primarily made of chrome-plated brass, with an operating pressure of no less than 0.35MPa. Installation requires rigorous pipeline flushing; during pipeline pressure testing, plugs are used instead of sprinklers. Fine water mist sprinklers can only be installed after successful pressure testing and flushing.
