Applications & Features： 1.Such series of production is one of the main equipments of getting the tough vacuum. 2.Its often used for sucking out air or other kind of gas from a sealing drum or a reaction pot. By taking special treatment, it can be used for sucking off the corosive gas or the dust gas. 3.Such series of production is widely used in chemical or food industry for vacuum distillarion, vacuum evaporation, vacuum crystallization, vacuum drying, vacuum straining,etc.