Another style pump sometimes used on waterjets is the direct drive pump. This pump uses an electric motor to turn a crankshaft that moves three or more pistons that create the water pressure, very similar to a car engine. Faster revolutions of the motor create higher pressure and more water volume. The basic concept for the direct drive is shown below.

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<img class="alignnone size-full wp-image-2850" src="http://www.wardjet.com/wp-content/uploads/2021/10/Waterjet-University_Nozzle-n-Orifice-Direct-Drive-Pump-Chart.jpg" alt="Waterjet University_Nozzle n Orifice Direct Drive Pump Chart" width="450" />

<img class="alignnone size-medium wp-image-6975" src="http://www.wardjet.com/wp-content/uploads/2022/03/nozzle-and-orifice-direct-drive-300x211.jpg" alt="nozzle and orifice direct drive" width="450"  />