The internal design of the venturi nozzle determines the performance of the unit. A unit may have more ports for additional accessories, but it must include the aforementioned three.įigure 1: Primary ports on a vacuum venturi. A venturi must have at least three ports to function, including the compressed air source, vacuum port, and exhaust port, as shown in figure 1. This low-pressure area “sucks” in surrounding atmospheric air from the vacuum inlet. The decreasing diameter of the nozzle increases the air velocity across the cavity, which creates a low-pressure pocket. A venturi can also be called a generator, an ejector, or an air-driven vacuum pump.Ī generator produces vacuum when compressed air flows through a venturi nozzle, as demonstrated in figure 1. In this article, a venturi is a device that takes in compressed air and converts it into vacuum. In simple terms, high-speed fluid can generate a vacuum. It is an example of the venturi effect, a fluid dynamics principle in which velocity creates a low-pressure point that induces vacuum flow. Posted on by Fluid Power Journal in All About Vacuum, Home Header, Recently in Fluid Power Journal 0 Commentsīy Dane Spivak, Engineering Manager, Davasol Inc.ĭo you ever wonder why it is hard to open a door when it is windy outside? The reason is vacuum is applied to the other side and pulls back against you.
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