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方向閥一般指方向控制閥。液壓閥是用來控制液壓系統中油液的流動方向或調節其流量和壓力的，方向控制閥作為液壓閥的一種，利用流道的更換控制著油液的流動方向。方向控制閥的種類有單向閥、液控單向閥、換向閥、行程減速閥、充液閥、梭閥等。

液壓閥是用來控制液壓系統中油液的流動方向或調節其流量和壓力的，方向控制閥作為液壓閥的一種，利用流道的更換控制著油液的流動方向。方向控制閥的種類有單向閥、液控單向閥、換向閥、行程減速閥、充液閥、梭閥等。

（1）按照流體在管道的流動方向，如果只允許流體向一個方向流動，這樣的閥叫做單向型控制閥，比如單向閥，梭閥等；可以改變流體流向的控制閥叫做換向閥，比如常用的兩位兩通，兩位三通，兩位五通，三位五通等。

（2）按照控制方式可分為電磁閥，機械閥，氣控閥，人控閥。其中電磁閥又可以分為單和雙電控閥兩種；機械閥可分為球頭閥，滾輪閥等多種；氣控閥也可分為單氣控和雙氣控閥；人力閥可以分為手動閥，腳踏閥兩種。

（3）按工作原理可以分為直動閥和先導閥，直動閥就是靠人力或者電磁力，氣動力直接實現換向要求的閥；先導閥是由先導頭和閥主體2部分構成，有先導頭活塞驅動閥主體里面的閥桿實現換向。

（4）根據換向閥桿的工作位置可以將閥分為2way，3way閥。

（5）根據閥上氣孔的多少來進行劃分，可以分為2port，3port，5port閥。

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