Steam Jet Vacuum Systems

Single-Stage Steam Jet Ejector

Principle of Operation

Fig. 555G, Fig. 555H, Fig. 556, and Fig. 562 Single-Stage Steam Jet Ejectors are based on the ejector-venturi principle. In operation, steam issuing through an expanding nozzle has its pressure energy converted to velocity energy. A vacuum is created and the high velocity of steam entrains air or gas and the mixture of gas and steam enters the converging end of the venturi, passes through the diffuser where its velocity energy is converted into pressure sufficient to discharge against a predetermined back pressure.


Small amounts of solids or liquids will not cause operating problems. Accidental entrainment of liquid slugs can cause momentary interruption in pumping, but no damage to equipment.


Decarbonating brewery water.
Creating chemical process vacuums.
Water treating by degasifying.
Used in degassing molten steel.
Perfume concentration.
Vacuum packaging.
Freeze drying;
Flash cooling.

For more detailed information about Single-Stage Steam Jet Ejectors, Bulletin 5-EH Literature.

To submit a Request for Quote (RFQ) for Single-Stage Steam Jet Ejectors, Adobe PDF or submit an online interactive RFQ Form for Steam Jet Vacuum Systems.

4-inch AS3 Fig. 556 Single Stage Steam Jet Ejector having 4-inch 150#RF Suction and Discharge flange.
Suction Connection: 4-inch 150# RF flange
Discharge Connection: 4-inch 150# RFSO flange
Motive Inlet: 2-inch 300# RFWN flange
Material: Carbon Steel, one piece body and tail with removable internal 304SS nozzle.

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Schutte & Koerting • 2510 Metropolitan Dr, Trevose PA 19053, USA • Tel: (215) 639-0900, Fax: (215) 639-1597