What is the minimum pressure required to create a vacuum in an eductor?

In understanding the operation of an eductor, it is important to note that the creation of a vacuum relies on the pressure differential between the inlet fluid and the surrounding atmosphere. The minimum pressure required to achieve this vacuum is fundamentally linked to the eductor's design and the specific application it is used for.

A minimum pressure of 120 psi is often necessary to generate sufficient suction, ensuring that the eductor can effectively draw in the fluid it is intended to handle. This level of pressure allows for an adequate velocity of the working fluid, which is essential for creating the necessary low-pressure zone that facilitates the vacuum effect. The design criteria for many eductors align with this pressure requirement due to the physics of fluid dynamics involved in the operation of such devices.

The other pressure levels mentioned may not provide enough pressure to develop a functioning vacuum in typical applications of an eductor. Thus, 120 psi represents a practical and commonly accepted threshold for ensuring that the system operates efficiently and effectively. Understanding this aspect is crucial for engineering applications that utilize eductors in processes such as mixing, pumping, or conveying materials.