Vacuum ejectors or vacuum jets extend the operating range of process vacuum systems that is beyond what can be achieved by liquid ring vacuum pump-based systems alone. Utilizing the venturi principle, the motive fluid (steam or air) entrains the process stream (non-condensables and condensables) discharging either into a condenser or the liquid ring vacuum pump.
Advantages include the following
- No moving parts
- Low cost
- Reduces load on other stages of compression (as a result, helps pull a deeper vacuum)