2WFCE 型先導(dǎo)式比例方向閥基本構(gòu)成包括：
帶比例電磁鐵 (3) 的先導(dǎo)控制閥
帶位置傳感器和模擬接口的集成電子元件 (4)
集成電子元件 (OBE) 將控制值與主級(jí) (2) 控制閥芯的位置理論值進(jìn)行比較。在存在控制偏差的情況下，先導(dǎo)控制閥 (3) 將激活控制線(xiàn)圈。以此調(diào)節(jié)控制閥芯。根據(jù)控制偏差的不同，主級(jí) (2) 控制腔或者以先導(dǎo)油（主級(jí)已關(guān)閉）加壓，或者已卸載
插裝閥與我們所說(shuō)的普通液壓控制閥有所不同，它的通流量可達(dá)到1000L/min,通徑可達(dá)200～250mm。
閥芯結(jié)構(gòu)簡(jiǎn)單，動(dòng)作靈敏，密封性好。它的功能比較單一，主要實(shí)現(xiàn)液路的通或斷，與普通液壓控制閥
組合使用時(shí)，才能實(shí)現(xiàn)對(duì)系統(tǒng)油液方向、壓力和流量的控制。
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