There are vacuum pumps of rotary vane series (2X, XD), water ring series (SZ,2SK,SK,2BE). reciprocating series (WLW), roots series(ZJ) of nine specifications, roots-water ring units (JZJS), roots-rotary vane unit (JZJX),roots- reciprocating pump unit (JZJW) and other products, which are widely used in metallurgy, chemical industry, medicine, textile, food, aviation, electronic, scientific research and other industries and sections. The following are the top sales series. 2X pump is one of the basic equipment for obtaining vacuum for airtight containers by exhausting gas. XD pumps are widely applied to the vacuum packing of various types of food, paper conveying in printing industry, vacuum suction molding in rubber and plastic industry, vacuum impregnation treatment of various castings, vacuum fixture of engineering industry, vacuum suction in surgeries of hospitals,vacuum power test,etc. SZ water ring vacuum pumps are not soluble in water, free of solid particles and non-corrosive so as to form a certain vacuum degree in sealing systems.