How are automatic nozzles and conventional nozzles different?
Conventional fog nozzles have a fixed or selectable gpm setting. These settings correspond to a particular discharge orifice, or tip size. In order for a conventional nozzle with a fixed opening to operate at the correct nozzle pressure of 100 psi, the proper gpm flow must be supplied. For example, a selectable gallonage nozzle with settings of 30, 60, 95 and 125 gpm will only deliver those flows of 100 psi of nozzle pressure.
There are two possible results when the conventional nozzle is not supplied with the rated or selected flow. First, inadequate flow provides a weak, ineffective stream that fails to reach the seat of the fire. Second, too much water flow creates excessive nozzle pressure making the hose line more difficult to handle and potentially jeopardizing the safety of the nozzle crew.
With an automatic nozzle, the discharge orifice continually adjusts depending on the flow to the nozzle. This sets the flow being supplied to the proper nozzle pressure and correct velocity for maximum extinguishing capability.
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