Applications & Features: 1.Starting up directly from Atmosphere Pressure for Evacuation. 2.Used either solely as Rough Pumps, or in combination with other high vacuum pumps as Backing Pumps. 3.They find wide application in the fields of metallurg, chemical, light industry, medical, electronics and LSI industries. 4.They can not be used for evacuating the oxygenic, poisonous and explosive gasses and gasses with can react with pump oil easily. Neither can they be used as compressor and transmission pump. 5.Such series XD of progressional vacuum pump is one of the indispensably equipments of light industry, food industry, delicate chemical and products of draught plastics.