力士樂壓力開關門是一種三通直接操作的減壓閥，即具有二次回路的壓力限制。
它用于限制系統壓力。二次壓力通過調節類型（4）設定。
閥門在初始位置打開。液壓油可以無限制地從通道P流向通道A。通道A中的壓力通過控制管路（6）同時施加在壓縮彈簧（3）對面的活塞區域。如果通道A中的壓力超過壓縮彈簧（3）設定的值，控制滑閥（2）將移動到控制位置，并將通道A中的設定壓力保持在恒定水平。
信號和先導油通過控制管路（6）從通道A內部流出。
如果通道A中的壓力由于執行器處的外力作用而進一步升高，則會進一步推動控制滑閥（2），使其緊靠壓縮彈簧（3）。
這樣，通道A通過控制滑閥（2）上的控制邊緣（8）連接到通道T（Y）。如此多的液壓油被排放到油箱中，壓力只能稍微增加。
彈簧室（7）的泄漏油總是通過通道T（Y）從外部排出。
對于從通道A到通道P的自由回流，可以選擇安裝止回閥（5）。
壓力表連接（1）允許控制二次壓力。
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