jet ejector pump

jet e·jec·tor pump

a suction pump in which fluid under high pressure is forced through a nozzle into an abruptly larger tube where a high-velocity jet, at a low pressure in accordance with the Bernoulli law, entrains gas or liquid from a side tube opening just beyond the end of the nozzle to create suction; for example, the pump by which steam is used to evacuate an autoclave, a water aspirator.
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