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How is Vacuum Produced ?
There are two basic ways of producing vacuum. The most widespread method is to use an electric-motor-driven, positive-displacement pump, Typical Electric Motor Driven Vacuum Pump System
The second method of producing vacuum is by using a no-moving-part venturi, also known as vacuum generators and ejectors. compressed air is allowed to flow which causes a venturi action. As the air expands and flows into the receiver tube, it creates a pressure lower than atmospheric pressure. This causes entrainment of the surrounding air which is more commonly referred to as vacuum flow. The entrained air, as well as the supply air, exhausts into the atmosphere
When To Use An Electric Motor Driven Vacuum Pump Versus A Venturi :
The application determines which one of the two methods is better suited. Though most applications can use vacuum from either one of the sources, one will clearly outweigh the other depending upon the design and application requirements from the point of view of cost, space, temperature etc. In general the following are the advantages of using venturi vacuum Pumps:
When Is A Venturi Undesirable?
|Model||Air Velocity (ft/s)||Vacuum Flow(l/m)||Vacuum Level(-kpa)||