A vacuum pump is a gadget or device that USES mechanical, physical, substance or physical-chemical ways of pump air away of a container to obtain a vacuum.Generally speaking, vacuum pump is a device that improves, generates and maintains vacuum in a closed space simply by various means.
Regarding 
to the working basic theory of vacuum pump, vacuum pump could be divided in to two types, namely gas catch pump and gas transfer pump.It Small Vacuum Pump really is trusted in metallurgy, chemical substance industry, food, electronic coating and various other industries.