方向閥一般指方向控制閥。液壓閥是用來控制液壓系統(tǒng)中油液的流動(dòng)方向或調(diào)節(jié)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(dòng)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(tǒng)中油液的流動(dòng)方向或調(diào)節(jié)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(dòng)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(dòng)方向，如果只允許流體向一個(gè)方向流動(dòng)，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(jī)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(jī)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(dòng)閥，腳踏閥兩種。
（3）按工作原理可以分為直動(dòng)閥和先導(dǎo)閥，直動(dòng)閥就是靠人力或者電磁力，氣動(dòng)力直接實(shí)現(xiàn)換向要求的閥；先導(dǎo)閥是由先導(dǎo)頭和閥主體2部分構(gòu)成，有先導(dǎo)頭活塞驅(qū)動(dòng)閥主體里面的閥桿實(shí)現(xiàn)換向。
（4）根據(jù)換向閥桿的工作位置可以將閥分為2way，3way閥。
（5）根據(jù)閥上氣孔的多少來進(jìn)行劃分，可以分為2port，3port，5port閥。
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