A liquid ring vacuum pumps is an energy-efficient rotating positive displacement pump found in many industries, including paper and polymers businesses, diesel/diesel engines, medical equipment, petroleum refineries, textile mills, aerospace, and semiconductor processes. A liquid ring vacuum pump has a series of copper tubes filled with liquid ring material. When the ring is rotated by an electrical current, it pumps the liquid from one tube to another. This liquid is very similar to a vacuum cleaner as it only pumps the waste materials away from the pump itself.
There are two types of liquid ring vacuum pumps: direct and indirect flow. A direct flow pump works by compressing a gas in a ring that is then fed into a compression stage. The ring's walls are made of a ring of metal containing holes that are punctured when the vacuum pump's impeller is turned by the moving fluid. This puncturing and expansion create a large amount of gas pressure behind the ring, which forces the air into the compression stage. As the gas expands, it pulls up on the piston and expands the opening of the casing, creating suction and ultimately the gush of escaping gas.
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