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。
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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