Steam Jet Vacuum Pumps


In steam jet vacuum ejector live steam expands through the inlet nozzle, issuing at high velocity. The powerful suction thus produced entrains air or vapours via the suction connection.


  • A single pump can manage very large flow volumes of up to 1000000 m³/h without problems.
  • Absolutely no difficulties in the case of process media with a strong tendency towards fouling and small amounts of solids or liquids
  • Corrosion/erosion resistance by choosing suitable material
  • Easy installation
  • High standard of operational reliability and vacuum performance
  • Low investment costs in comparison to other possible alternatives
  • No moving parts
  • Practically maintenance free
  • Simple compact construction

If a plant is to be evacuated within a given time, for example, during starting up, and the vacuum pump which maintains the operational vacuum takes longer than the given time, a jet pump is added as a start-up pump or pre-evacuator to speed up the evacuation. It is brought into operation together with the vacuum maintaining pump, but works only until the required vacuum, or a determined intermediate vacuum is reached.

Steam jet vacuum pumps are commonly used for handling condensable and noncondensables in processes such as

  • Absorption
  • Cooling
  • Distillation
  • Exhausting air from vacuum pans and evaporators
  • Exhausting tire molds
  • Freeze drying
  • Handling corrosive gases
  • Mixing
  • Priming centrifugal pumps
  • Production of vacuum in stirred vessels in discontinuous processes
  • Vacuum packaging
Range of Operation

    When compressing against atmospheric pressure, used for the production of vacuum down to a suction pressure approx. 100 mbar.
    Single stage start-up jet pumps can, according to the motive steam pressure, achieve a suction pressure of 50 – 200 mbar.

  • Cast iron
  • Cast stainless steel
  • Other materials on request
  • Steel or stainless steel
  • Temperature change resistant porcelain

Typical Applications: