Steam Jet Vacuum Pumps (Single-Stage)

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 for single stage steam jet vacuum pumps are shown below:

Evacuation of the pump lines of non self-priming pumps

Production of vacuum in suction filter or similar types of filters

Lifting liquids