Liquid ring vacuum pumps are a type of positive displacement pump commonly used in industrial settings to create a vacuum. They work by rotating a ring of liquid, typically water, around a cylindrical chamber. As the ring rotates, centrifugal force creates a partial vacuum in the container, drawing in gas or air from the inlet.

Unlike other models, particularly rotary vane or scroll pumps, liquid ring vacuum pumps do not use oil as a lubricant or coolant. Instead, the liquid ring serves as both a sealant and coolant for the chamber. This makes them ideal for applications where the medium handled may be contaminated with oil or other fluids.

Another key advantage of liquid ring vacuum pumps is their ability to handle a range of operating pressures and flow rates. This makes them suitable for various industrial applications, including chemical processing, power generation, and pulp and paper production.