Gas Jet Vacuum Pumps, also called ejectors, employ a gas, often air, as the motive medium, to pull a vacuum. As well as providing vacuum for general duties, these units are also regularly used for evacuating suction lines to prime centifugal pumps, creating siphons and elevating liquids. They are also used to compress low pressure gases up to some more useful intermediate pressure. A particular application for this type of ejector, is to be used in conjuction with a Liquid Ring Vacuum Pump. Here air, at atmospheric pressure, is used as the motive medium, to achieve vacuums higher than could be achieved by the Liquid Ring Pump operating alone.

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