Most major industries use vacuum to improve heat transfer effectiveness, boost evaporator performance, aid filtering and drying operations, and produce superior melted metals. Vacuum is produced by vacuum pumps, blowers, and steam jet ejectors. In certain situations, a combination of these devices produces the most efficient and cost effective design. Steam jet ejectors are also commonly selected due to their lower first cost and simplicity of design. However, steam jets have much higher operating costs.
All vacuum producing devices are actually compressors discharging at or near atmospheric pressures.
Their compression to that discharge pressure forces them to draw a vacuum at their inlets. And Furthermore . . .