In the field of vacuum processing, steam jet ejectors have been most widely used. Steam jet ejectors are ideal for use on all kinds of stills, vacuum deaerators, evaporators, crystallizers, oil deodorizers, steam vacuum refrigeration, flash coolers, condensers, vacuum pan dryers, dehydrators, vacuum impregnators, freeze dryers, vacuum filters, and more recently on stream degassing of metals and vacuum melting of metals.