Ive heard that multi-stage venturi units are the best vacuum generators. Is that true?
A multi-stage or multi-chamber vacuum pump is made up of 2 to 4 separate in-line venturi’s that work in sequential stages using the same input air supply. Each chamber is designed to function up to a specific vacuum level. When a chamber reaches a prescribed vacuum level, a flap automatically closes off that chamber. This process continues until only the first chamber is drawing vacuum, thus the multi-stage effect. Learn more by clicking here. What’s important to note is that most vacuum lifting applications work above 9″ Hg. Typically, chambers 2, 3, and 4 have shut down before reaching 9″ Hg, the multi-stage pump literally turns itself into an inefficient single-stage pump. The problem with the multi-stage pump is that it must maintain a high velocity of flow in chambers 2-4. Air consumption remains high, even though vacuum flow has decreased by almost 75%. In addition, if a vacuum filter is not used, and debris or dust enters the multi-stage pump, it can clog the flap valves requiri
