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Liquid ring vacuum pump 1. Operation steps A. Open the pump 1. First fill the vacuum pump with working fluid； 2． Check the lubrication of the pump, whether the pressure gauge and temperature gauge are easy to use, whether the connecting parts are tightened, and whether the working fluid of the pump meets the requirements, that is, it is equivalent to the center line of the pump shaft. Ensure that the valves and overflow lines of the system pipelines with working liquid between the pump and the heat exchanger are open. This will ensure that the liquid in the pipeline system connected to the heat exchanger and gas-liquid separator reaches a reasonable height. 3． Turn the car to ensure it can be turned easily and freely ； 4． Supply cooling water to heat exchanger ； 5. priming pump ； 6． Open the inlet valve, bypass valve, and vent valve on the top of the gas-liquid separation tank. ； 7. Check again to see if there are no abnormalities before running normally. B. Stop or switch the pump 1. After starting the backup pump according to the pump start procedure, ； 2． Close the inlet valve of the pump; 3. Stop pump ； 4． Close the make-up fluid inlet valve. 2. Routine maintenance 1. Regularly check the lubrication condition of the pump to achieve the "three filters" and "five fixes".” ； 2. Always check the operation of bearings, seals, etc. and the tightening of the pump, and check for abnormal conditions such as vibration, noise, etc. ； 3. Turn the machine 180 degrees every day during the day to prevent corrosion and shaft bending deformation. ； 4. Always check the cooling water condition to prevent equipment and pipelines from freezing. ； 5. Frequently check the use of components to ensure they are complete and intact.