減壓型閥是一種液壓驅動的定向滑閥。它控制流的開始、停止和方向。換向閥基本上由閥殼（1）、主控制滑閥（2）、一個或兩個回位彈簧（3.1）和（3.2）組成，在彈簧回位或彈簧對中的閥門上，還有導流板（11）。主控制滑閥（2）由加壓直接驅動。主控制滑閥（2）通過彈簧或加壓保持在零或初始位置。先導油供應和回流是外部的（請參閱先導油供應）。
4/3方向閥，控制滑閥的彈簧對中
在此版本中，主控制滑閥（2）由兩個回位彈簧（3.1）和（3.2）保持在零位置。兩個彈簧室（6）和（8）通過導流板（11）連接到端口X和Y。在主控制滑閥（2）兩個前側面之一的先導壓力負載下，滑閥移動到開關位置。在閥門中，所需的端口以這種方式連接。另一側的彈簧在壓力控制滑閥區域減壓時將滑閥返回零位或初始位置。
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