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Single-stage ejectors (right) are used to create vacuum ranging from atmosphere to 3" Hg absolute. Higher vacuum, ranging from 3" Hg absolute to 3 microns Hg absolute, may be achieved by multiple staging. Multiple-staged systems often include surface or direct contact type condensers. Intercondensers reduce motive steam requirements and, under certain conditions, permit recovery of product condensate.
Shail Vac Engineering multiple-staged systems (below left) are custom-engineered for optimum performance and minimum utility consumption. They are designed to handle a variety of process gases including air, water, HCl, butane, SO2, ethylene glycol, and many other organic and inorganic vapors. Where conditions warrant, corrosion-resistant materials of construction are utilized.
While most ejectors are steam motivated, other fluids can be used. For example, to maintain purity of a product, a process compatible fluid can serve as the motive fluid.
Shail Vac Engineering supplies complete packaged, turnkey systems which include ejectors, condensers, interconnecting piping, instrumentation, and electronic controls.
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