Steam Jet Compressor


Steam jet compressors use the energy of a high pressure vapour to compress low pressure vapours to a medium pressure level. Normally such steam jet compressors are operated by steam and mostly serve to compress water vapours. Basically, however, steam jet compressors can be operated with most normal vapours to compress a variety of different vapours. The motive nozzle converts the energy of the motive steam into velocity. The motive jet produced draws in the vapours to be compressed, mixes with them thereby accelerating them.


Small dimensions due to the high flow velocities, therefore, large vapour volumes in vacuum are easily handled.

  • Cooling of aggressive liquids by this method eliminates the need for heat exchange surfaces.
  • Energy/cost saving
  • High operational safety and low maintenance as no moving parts are involved.
  • Long operational life expectancy as steam jet compressors can always be constructed of a suitable corrosion resistant material.
  • Low investment cost due to the relatively simple construction.
  • The steam consumption can be adjusted to suit a varying counter pressure by throttling.

In the positive pressure range the compressed exhaust vapours are used for heating.

In the broadest concept they may be considered as heat pumps. In this way, heat at a low temperature is raised and reused.

Steam jet compressors are used in

  • Cooling
  • Crystallization
  • Degassing
  • Deodorization (as in edible oil industry)
  • Distillation
  • Drying under vacuum
  • Evaporating
  • Heat recovery from process effluent water
Range of Operation

    A single stage has a maximum compression ratio of up to 20:1.

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