RRZ FIREFIGHTING NOZZLE – TURBINE FOR HIGHWAY TUNNELS FIRE PROTECTION
The new RRZ firefighting nozzle generates an atomized water cone with a large ground cover. This device works with a multi-orifice head connected to a shaft, driven to rotation by a hydraulic turbine. The operating principle is very simple. A suitably sized impeller has the task of transforming the tangential thrust of a water jet into torque applied to a shaft. The delivery fluid is therefore sufficient to actuate the turbine operation, which takes advantage of the pressurized water either to rotate and to generate the spray of the multi-orifice head. The high rotation makes simple dart throws recreate a discreetly atomized water cloud, uniformly distributed over a perfect circumference. The simple construction architecture makes it an easy and fast product in all installation and maintenance operations.
The multi-orifice head is able to achieve an instant 180° spray angle that quickly converts into a full-size, with a quality of atomized spray increasing when pressure increases. At low pressures (from 1 to 2 bar), a wider wetting radius is achieved, up to 6 m., while maintaining a rather coarse drop diameter. At higher pressures (around 5 bar), atomization is favored by a considerable reduction in drop diameter, which creates a very fine rain effect on the ground.