An ejector is a form of pump which has no moving parts. A marine ejector arrangement is shown in Figure below. A high-pressure liquid or a vapour such as steam discharges from a nozzle as a high-velocity jet and entrains any gases or liquids surrounding the nozzle. The mixture enters a converging-diverging diffuser tube where some of the kinetic energy is converted into pressure energy.

Ejectors can be arranged as single or multi-stage units and have particular applications, for example the air ejector in a closed feed system .

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