How Does Liquid Ring Vacuum Pump Work


Liquid ring vacuum pumps are positive displacement pumps providing process vacuum in industrial applications such as plastic & rubber, medical & pharmaceutical, chemical & petrochemical, electrical power, food & beverage processing and packaging, mining, oil & gas, pulp & paper, and textile industry.

Liquid ring vacuum pumps typically use liquid or other compatible liquid as the sealant to achieve a vacuum. The most widely used liquid is water. Liquid ring pumps are available in single and two stage designs.

An impeller is installed eccentrically in pump casing. The seal liquid forms the ring inside a pump body as the impeller rotates, creating small chambers for gas to be trapped. 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. The exhaust gas and residual water discharge from the outlet. If user want gas and water discharge separately, simply install a separator will be enough.  

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