各位大侠，我有一个实验方法，对里面描述的液相系统不是很确定，从中抽取了部分不熟悉的地方，帮忙看看 HPLC System ： Two Pump ，Switching Valve: two position, six ports这里的阀和普通的六通阀有什么区别？ Analysis：Inject 50 μL of the Sample Preparation into the chromatographic system. After each injection of the sample preparation, wash away the polymeric material from the precolumn by passing the mobile phase through the column backwards at the same flow as applied in the test。阀的图例见附件
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