Fore vacuum pumps are defined as those which exhaust to atmospheric pressure. They are also required to support secondary pumps or to attain the initial conditions for their operation. There are two types of fore vacuum pumps:
- Dry-running backing pumps such as scroll, screw and diaphragm pumps.
- Oil-sealed pumps such as rotary vane pumps.
In this blog post, we’ll examine the key working principles of common multi-stage roots fore vacuum pumps.