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Liquid Ring Pumps

Inside the pump, an impellor rotates without contact within the pump casing, which causes a rotating ring of liquid to form the compression-chamber seal on the front and seals the blades of the impellor against one another. The impellor is positioned eccentrically within the cylindrical casing, creating a variable compression chambers between the blades during rotation, which causes the conveyed gas to be compressed within one full revolution.

Liquid rings are typically used as a vacuum pump, but since the pumps always create a pressure difference during operation, they can also be used as a compressor when pumping gas from the surrounding atmosphere.