Liquid jet vacuum pumps

In these devices the liquid jet from the motive nozzle emerges at a high velocity, entraining air, gas or vapour in the head and compressing it to atmospheric pressure. Vapours can be partly or completely condensed. In principle, any liquid can be employed as motive medium providing that the physical characteristics such as density, viscosity and boiling behaviour are known for design purposes.

Advantages
  • Automatic control
  • Corrosion and erosion resistant
  • Easy to install
  • Low cost
  • Simple and reliable
  • Wide range of materials such as steal, stainless steal, cast iron, bronze, Teflon and graphite
Applications
  • Deaerating apparatus in which solvent vapours are produced
  • Deaeration of pressure vessels and condensers
  • Diverse chemical vacuum processes
  • Efficient mixing of suction gases with a liquid due to the high flow velocity
  • Evacuating siphon lines
  • Particularly adapted to start-up evacuation of vacuum plants
  • Start-up evacuation of suction pipelines of large centrifugal pumps
  • Vacuum distillation
  • Vacuum drying
  • Vacuum generation in turbine condensers in power stations
Range of Operation
    • The lowest suction pressure which can be obtained (with zero suction capacity) corresponds to the vapour pressure of the motive liquid which is dependent on the temperature of the liquid. Higher vacuum can be reached by the further cooling of the motive medium.
    • If the vapour pressure can be disregarded, it is possible to achieve an absolute suction pressure of up to 4 mbar.
Materials
  • Cast iron
  • Cast stainless steel
  • Other materials on request
  • Steel or stainless steel
  • Temperature change resistant porcelain
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