Steam Ejectors

Steam ejectors use a motivating fluid and pressure-to-velocity energy conversion to create vacuum.

Nozzles convert high-pressure steam to high-velocity steam in the mixing chamber to create a low-pressure region.

As the steam and entrained air travels down the diffuser, kinetic energy is lost and pressure increases again.

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

Multiple-nozzle designs, a Croll-Reynolds specialty, improve efficiency.

Steam ejectors mount in any orientation and have a low maintenance design with no moving parts.

Multi-stage systems offer improved vacuum, and can contain up to six ejector stages.

The number of ejectors is determined by the level of vacuum required.

Condensers are included to remove steam from the system and reduce load on later stages.

Shell and tube condensers, such as the one shown here, cool the steam down using arrays of cooling tubes.

Condensate is drained from the system, allowing more steam to be added at the next ejector.

Each system is a custom design and multiple condensers can be used as well.

Steam ejector systems provide the lowest capital costs among vacuum process pumps.

To learn more about steam ejector systems and to discuss your specific vacuum process or application, contact Croll-Reynolds or visit

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