What is Liquid Ring Vacuum Pump

Characteristics and Application

A liquid ring vacuum pump is a positive-displacement pump. Pumps are typically powered by an induction motor.

Liquid ring vacuum pump normally runs with water as the working medium. It can suction air, steam, gas that contains much water, and powder gas without granule.

Liquid ring pump is mainly used in low vacuum and large capacity industry, such as medical and pharmaceutical industry, chemical industry, textile industry, electric power plant, food related industry, metallurgy and paper making industry.


Liquid Ring Vacuum Pump Working Principle

An impeller is installed eccentrically in pump casing. When  impeller rotates, liquid (usually water) is fed into the pump and, by centrifugal acceleration, forms the so-called liquid ring.

This liquid ring creates a space between the impeller vanes, which form compression chambers. Due to the eccentric installation of the impeller, the spaces enlarge and the gas (often air) is drawn into the pump through the inlet port. As the impeller further rotates, the spaces between impeller vanes are reduced, so that the gas is compressed. When the pressure is larger than the outside pressure, gas is discharged from the outlet port. By continuous rotating, the gas will be discharged continuously, so a vacuum state is created.

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