Atmospheric Air Ejectors

Boosting Liquid Ring Pump Performance

Transvac manufactures a comprehensive range of Atmospheric Air Jet Ejectors used to extend the operating range of Liquid Ring Vacuum Pumps.

The inlet pressure of a Liquid Ring Pump is limited to approximately 30 mbar abs because of the vapour pressure of its seal liquid (usually water). The addition of an Atmospheric Air Jet Ejector enables the Liquid Ring Vacuum Pump to operate outside its cavitation range allowing operation down to nearly 4 mbar abs.


  • Allows operation at higher vacuum than the liquid Ring Pump can achieve alone
  • No additional energy costs (motive air is free)
  • Custom designed to suit individual pump characteristics
  • No moving parts in Ejector
  • Ejector virtually maintenance free
  • Ejector silent in operation
  • Materials to suit process
  • Robust design
  • Simple operation
Atmospheric Air Ejectors

Examples of different Atmospheric Air Ejectors

In operation an Atmospheric Air Jet Ejector uses the energy available from the expansion of atmospheric air to the Liquid Ring Pump inlet pressure to drive the Ejector. Atmospheric air enters the Ejector and passes through the nozzle where the pressure energy is converted into kinetic energy. On leaving the nozzle at high velocity a region of low pressure is created in the suction chamber which entrains the process fluid. The two streams then combine within the throat of the Ejector before being decelerated in the outlet cone to recover pressure to suit the Liquid Ring Pump inlet capability.

Materials of Construction

Standard materials of construction include Carbon Steel, Stainless Steel, Polypropylene, PTFE and Titanium. Other materials are also available. Connections can be flanged or screwed.

Further Info

Case Studies

View our case studies for Oil & Gas, Steam, Water Treatment & Pharmaceutical applications

Case studies for Oil & Gas, Steam, Water Treatment & Pharmaceutical applications