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How Liquid Ring Vacuum Pumps Operate

Liquid ring vacuum pumps are machines used in most industries to safely and reliably handle hazardous gas streams. As a result, they are heavily relied upon in industrial applications, including oil and gas, textiles, mining, and electrical power production, and as an integral part of the air purification system.

If you are interested in liquid ring vacuum pumps and would like to find out how they operate, the sections below will inform you.

Components of Liquid Ring Vacuum Pumps

Most liquid ring vacuum pumps come with at least five primary components, including the following:

Inlet port

This port is responsible for leading potentially dangerous gas into the vacuum pump's inner cylinder. It is a passage from the vacuum pump's outside to the cylinder's inner ring.

Discharge port

The discharge port releases pressurized gas after the vacuum has served its purpose. In a nutshell, its function is to expel the gases from the vacuum pump. It is usually located on the pumps outside, 90º from the inlet port.

Inner cylinder

The most significant part of the gas vacuuming process takes place in the cylinder. The rotor's rotation inside it sucks gas through the inlet port, in conjunction with the liquid turning along the cylinder's upper circumference.


This component is comprised of several blades that rotate continuously inside the vacuum pump's cylinder. The rotor contains the liquid used, which, in turn, generates a vacuum effect to pressurize the gas that is sucked in.

Discharge valve

The discharge valve is located on the central mechanism that is responsible for swiveling the rotors. It primarily deals with the gas immediately after it has been pressurized.

The newly pressurized gas molecules get discharged through this component half a revolution after suction into the cylinder.

Apart from the components outlined above, a liquid ring vacuum pump often comes with extra accessories, including inlet check valves, isolation valves, flexible connectors, inlet vacuum gauges, and others.

How the Mechanism Works

A liquid ring vacuum pump uses seal liquid to form a ring inside the pump's cylinder as the rotor swivels. That, in turn, forms small chambers where potentially dangerous gas gets trapped. Then, as the rotor revolves, it compresses the trapped gas, ready for pumping.

The compressed process releases heat which dissipates into the liquid, while the gas stream is separated from any liquid discharged into the exhaust. A vapor-liquid separator gets used in most cases to remove the working liquid discharged after compression.

Do You Need a Liquid Ring Vacuum Pump?

If you are considering getting a liquid ring vacuum pump, there are a few things you need to consider, including the vacuuming level you need and the right supplier. There are numerous liquid ring vacuum pump suppliers in the market today, so shop wisely.

Ensure you acquire your vacuum pump from a local supplier. Look for relevant user reviews to get a clear picture of what a particular supplier offers.