6. Turn the pulley of the rotary vane vacuum pump by hand to check the operation. After there is no abnormality, turn on the power again and pay attention to the direction of rotation.

　　7. After using the rotary vane vacuum pump for a period of time, the belt becomes loose, and the position of the motor should be adjusted. Pay attention to replenishing the pump oil. When it is found that the pump oil is mixed with sundries or water, it is necessary to replace the new oil and clean the pump body. It is not allowed to use volatile liquids such as acetic acid and acetone to clean the pump body.

　　8. Check the ultimate vacuum of China's rotary vane vacuum pump with a compressed mercury vacuum gauge. If the meter has been fully pre-exhausted, the pump temperature is stable, the pump port and the meter are directly connected, and the ultimate vacuum will be reached within 30 minutes of operation. The value measured by the total pressure gauge is related to the pump oil, vacuum gauge, and regulatory errors, and sometimes the error may even be large.

　　9. If the relative humidity is high, or the pumped gas contains more condensable steam, after connecting the pumped container, the gas ballast valve should be opened, and the gas ballast valve should be closed after 20-40 minutes of movement. Before stopping the pump, the gas ballast valve can be opened for 30 minutes without load to prolong the life of the pump oil.

　　10. When the Chinese rotary vane vacuum pump is stopped, in order to maintain a certain degree of vacuum in the vacuum system, the three-way valve should be rotated to close the vacuum system, and the suction pipe of the pump is connected to the atmosphere. Turn off the power and stop the operation. Close the exhaust port and cover the pump tightly.