The SmartVac II Vacuum Control Unit from Pierson Workholding is an example of a Vacuum Generator type of pump. This unit converts 80 PSI of compressed air into a vacuum of 28″ HG using no moving parts. These units do not require tanks or filters since fluids and particles simply pass through the system. Even though the vacuum flow (0.5 CFM) is lower than the two other types, these still reach maximum vacuum quickly (1-2 seconds) in low volume applications such as vacuum chucks and small fixtures.
Bottom Line – These setup easily, are simple to maintain and are ideal for wet or dirty environments found in metal and plastics machining.