Operation of the Steam Ejector. Animation by Croll Reynolds. Steam-ejectors use a motivating fluid (steam) and pressure-to-velocity energy conversion to create vacuum.

Nozzles convert high-pressure steam to high-velocity steam in the mixing chamber.

Steam and entrained air travel down the diffuser, losing kinetic energy and increasing pressure.

Steam ejectors handle high volumes of gasses, including wet, corrosive, or particulate-laden vapors. Steam ejectors operate in rough or medium vacuum range (760-0.02 torr) with operating pressures to 0.003 torr.

Steam ejectors’ low-maintenance design has no moving parts and can be mounted in any orientation. Systems can contain up to six ejector stages, determined by the level of vacuum required.

W-Stage Ejector
X-Stage Ejector
XY Condenser
Y-Stage Ejector
YZ Condenser
Z-stage Ejector

Condensers remove steam from the system and reduce load on later stages. Steam ejector systems provide the lowest capital costs among vacuum process pumps.

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