... pre vacuum 初真空 pre vacuum pump 预备真空泵 preacceleration 预加速 ...
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... pre op test 运行前试验 pre vacuum pump 预真空泵 preacceleration 预加速 ...
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pre ure vacuum pump 真空压力泵
low pre ure vacuum pump 高真空泵
vacuum pre ure pump 真空压力泵
pre e vacuum pump 预真空泵
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The set takes Roots pump as its main pump and spinning vacuum pump as pre-stage pump.
本机组采用罗茨泵作为主泵，以旋片式真空泵作为前级泵。
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In between, an electromagnetic vacuum inflation valve is installed in series, which opens and closes with the switch of the pre-stage pump.
在前级泵与主泵中间串联一个电磁真空充气阀，随前级泵开关而启闭。
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