What are automatic nozzles and how do they function?

An automatic nozzle maintains a relatively constant pressure over a wide range of flows. Such nozzles have an arrangement in the nozzle which controls the flow by restricting the orifice outlet to maintain pressure.

If the pressure is relatively low, the nozzle orifice will automatically restrict the flow, causing pressure buildup at the outlet, and consequently resulting in a good quality discharge pattern. Similarly, if the pressure increases, the orifice opens to allow more flow, again adjusting to a constant pressure at the outlet of the nozzle.

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