2WFCE 型先導式比例方向閥基本構成包括：
帶比例電磁鐵 (3) 的先導控制閥
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 (2) 控制閥芯的位置理論值進行比較。在存在控制偏差的情況下，先導控制閥 (3) 將激活控制線圈。以此調節控制閥芯。根據控制偏差的不同，主級 (2) 控制腔或者以先導油（主級已關閉）加壓，或者已卸載
插裝閥與我們所說的普通液壓控制閥有所不同，它的通流量可達到1000L/min,通徑可達200～250mm。
閥芯結構簡單，動作靈敏，密封性好。它的功能比較單一，主要實現液路的通或斷，與普通液壓控制閥
組合使用時，才能實現對系統油液方向、壓力和流量的控制。
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