Roots vacuum pump pre-pump principle of matching

Normally, the principle of matching front-stage pump of Roots vacuum pump is as follows: 1. Pre-stage pump is required to pre-vacuum the main pump required. 2, the maximum allowable discharge pressure of the main pump, the former pump must discharge the maximum amount of gas discharged from the main pump in time, the former pump pumping speed in accordance with the actual pumping speed at the actual pumping speed. 3, doubles as pre-pumping pump to meet the pre-pumping time and pre-pumping vacuum requirements.