![]() ![]() ![]() Multi-stage non-condensing ejectors shown right are used where lower suction pressures are specified. ![]() Single-stage units typically discharge at or near atmospheric pressure. They are generally recommended for pressure from atmospheric to 3 Hg. Single-stage ejectors shown right are the simplest and most commonly used design. ![]() Ejectors are generally categorized into one of four basic types: single-stage, multi-stage non-condensing, multi-stage condensing and multi-stage with both condensing and non-condensing stages. This change from pressure head to velocity head is the basis of the jet vacuum principle. This is based on the theory that a properly designed nozzle followed by a properly designed throat or venturi will economically make use of high pressure fluid to compress from a low pressure region to a higher pressure. Steam ejectors are designed to convert the pressure energy of a motivating fluid to velocity energy to entrain suction fluid and then to recompress the mixed fluids by converting velocity energy back into pressure energy. ![]()
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