力士樂換向閥是利用閥芯相對(duì)于閥體的相對(duì)運(yùn)動(dòng)，實(shí)現(xiàn)油路換接，或者是接通、關(guān)斷，從而實(shí)現(xiàn)液壓執(zhí)行元件的啟動(dòng)、停止或改變運(yùn)動(dòng)方向。

對(duì)換向閥的基本要求是，液流通過閥的壓力損失要小，泄漏要小，換向要求平穩(wěn)可靠。 
換向閥的種類很多，按閥芯的結(jié)構(gòu)分，有滑閥式和轉(zhuǎn)閥式兩種。滑閥式換向閥用的多，有如下優(yōu)點(diǎn):較為簡單的結(jié)構(gòu)，有高度的換效能，閥芯徑向力均衡，操作力低，摩擦小，易于實(shí)現(xiàn)多種控制功能。按操作方式分有手動(dòng)、機(jī)動(dòng)、電動(dòng)、液動(dòng)、電液動(dòng)等多種。按閥芯工 
作在閥體內(nèi)所處的位置區(qū)分有二位和三位閥。按換向閥的接口分有二通、三通、四通和五通四種。 
1、滑閥式換向閥的工作原理和機(jī)能 
我們以力士樂公司W(wǎng)E型三位四通電磁換向閥為例來說明。圖10是結(jié)構(gòu)圖，主要由閥體（1）、電磁鐵（2）、滑閥（3）及復(fù)位彈簧（4）等組成。電磁鐵不通電時(shí)，滑閥即閥芯由復(fù)位彈簧保持在中間位置或初始位置（對(duì)于二位閥）。在此位置，所有油口 P. T. A. B靠閥芯上的肩和閥體上的環(huán)形槽的結(jié)構(gòu)關(guān)系都是相互隔開的。

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