Ejectors
An ejector is a vacuum pump that is driven by injected steam or similar mediums.
It has a simple construction for virtually trouble-free operation. And it is easy to be manufactured for large volume rate. Ejectors are used in a variety of applications including degassing equipment for molten steel, and polymerization facilities for synthetic fiber.
A standalone ejector can compress up to atmospheric pressure, or ejectors can be used in series to attain even higher vacuum condition. They can also be used with the other type of vacuum pumps to build a vacuum pump system.