Vacuum pumps can operate without any oil lubrication, have good durability, are easy to install and maintain, are portable, do not produce oil smoke, do not pollute the environment, and can achieve a vacuum of 550 – 757 mmHg with a flow rate of 12 – 350 LPM. They are used in gas analysis and physical experiments, airtightness testing, vacuum suction in hospital operating rooms, automation industries, electronic and semiconductor equipment, medical fields, laboratories, packaging machines, labeling machines, coating machines, exposure machines, automatic sorting machines, robotic arms, and semiconductor LED automatic inspection machines.