(1) Determine the type of the main pump of the vacuum unit based on the ultimate vacuum that the vacuum chamber needs to reach when there is no load.
The ultimate vacuum of the main pump is selected to be higher than the ultimate vacuum of the vacuum chamber, usually half an order of magnitude to an order of magnitude higher.

(2) Select the main pump according to the working pressure required by the DVE vacuum pump in the process of production.
The working pressure range of commonly used DVE vacuum pumps. The working pressure of the vacuum chamber must be kept within the pressure range of the best pumping speed of the main pump.

(3) Choose the size of the main pump according to the amount of gas released in the process, the amount of gas released in the vacuum chamber and the total amount of leaked gas in the system.

(4) Select the main pump according to economic indicators.
In the DVE vacuum pump that can also meet the requirements of working pressure and pumping rate, compare the investment cost and the daily maintenance and operation cost, and select the main pump with good cost performance.
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