With the development of vacuum application, there are many kinds of vacuum pumps, whose pumping speed is from 0.5 liter per second to hundreds of thousands and millions of liters per second. With the application of vacuum technology in the field of production and scientific research, the pressure range is becoming wider and wider. Most of them need several vacuum pumps to form a vacuum pumping system to pump together to meet the requirements of production and scientific research process.

Common vacuum pumps include: dry screw vacuum pump, water ring pump, reciprocating pump, slide valve pump, vane pump, roots pump and diffusion pump. These pumps are indispensable in the application of vacuum technology in various industries of national economy