VACUUM PUMP PRINCIPLES OF OPERATION
 

Single Stage TD Pumps
· Used primarily  for material transport applications. Solid materials
that are entrained in the vacuum flow pass through the pump.
· Compressed air is forced through the annular orifice.
· Rapid expansion results in the creation of vacuum.
· Vacuum creates flow directly through the pump.

Single Stage AV Pumps
· Used primarily for evacuating and material handling applications.
· Compressed air is forced through a small circular orifice.
· Rapid expansion creates low pressure in the vacuum chamber.
· Compressed air and vacuum flow are exhausted.


Multistage Pumps
· Initially both flapper valves are open.
· Vacuum is created in all three chambers and initial vacuum flow rates are high.
· When vacuum level in manifold reaches 3-5"Hg, the flapper valve closes off the third chamber.
· Vacuum flow rates are reduced.
· When vacuum level in manifold reaches about 10"Hg, both flapper valves close and
  pump reaches its ultimate vacuum level operating as a Single Stage pump.