What Is Medium Velocity Spray Nozzles

What Is Medium Velocity Spray Nozzles?

FOREDE Medium Velocity Water Spray Nozzle is an open orifice, directional spray nozzle, designed for use in water spray fixed systems for fire protection applications. MV nozzle comes in various materials of construction. The nozzle is available in brass, stainless steel construction. The nozzle has an external deflector that discharges a uniformly filled cone of medium velocity water droplets. It comes with option of several k-factors and spray angles and therefore any system designer is able to effectively integrate the nozzle for water spray applications.

In case of water spray systems, unlike sprinklers, water is discharged through all the Nozzles at the same time, usually achieved by the opening of a deluge valve (or a manual valve) and achieves the required discharge density.
Medium velocity spray nozzles are used for fire control, suppression or exposure protection and project water droplets of 0.4 mm or less, with a velocity of between 15 and 20 m/s. High velocity nozzles are specifically used for protecting thicker oils, where the formation of a water/oil emulsion on the liquid surface is necessary for suppression. Therefore, in HV nozzles, coarse droplets 1.5 to 2.5 mm dial are projected at velocities exceeding 20 m/s. This requires operating pressures from 3.5 to 6 bar. Both nozzles can have different flows (K factors) and angle patterns, depending on design requirements.