前级泵是用于维持某一真空泵前级压强低于其临界前级压强的真空泵。如罗茨泵前配置的旋片或滑阀泵就是前级泵。
是以罗茨泵为主泵，以旋片泵为前级泵串联而成。
Roots pump is the main pump to pump for the former spin-pump series from.
本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。
The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.
它可以单独使用，也可作为增压泵、扩散泵、分子泵的前级泵使用。
It can be used alone, but also as a booster pump, the proliferation of pumps, pump-pump using the former.
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