When do you use a vacuum pump and when do you opt for an ejector to generate a vacuum?


Rotary vane vacuum pumps are primarily used in applications demanding a high level of the final vacuum with a large volume flow at the same time. Areas of application are, for example, vacuum supply for centralized vacuum systems or for handling sealed work-pieces.

Their performance range: Final vacuum up to ~ -29.5 inHg, volume flow ~ 1.18 scfm up to about 176.55 scfm.

Side channel blowers offer a very high volume flow with a low to medium level of vacuum: Performance range: Final vacuum up to ~ -4,351 psi, volume flow up to 182.44 scfm.

Their application areas: Handling of porous products or products having a high degree of leakage, pneumatic extraction or evacuation of particles that are not too coarse or abrasive, for example, extraction of wood dust in the timber processing industry.

Ejectors provide a high level of final vacuum (~ -26.58 inHg) with low to medium volume flows at the same time (10 l/min. up to around 800 l/min.). They can be mounted directly in the suction line or on the suction cups.

Their application areas: targeted vacuum supply directly at the material to be handled, e.g. supply to suction cup units in a packaging machine. They represent an economic alternative to vacuum pumps, particularly for smaller quantities of suctioned air. Over and above this, FIPA ejectors are practically maintenance-free.