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減壓閥是利用液流流過縫隙產生壓力損失，使其出口壓力低于進口壓力的壓力控制閥。

　　按調節要求不同，有定值減壓閥，定差減壓閥，定比減壓閥。其中定值減壓閥應用廣，又簡稱減壓閥。

　　減壓閥由壓力先導閥和主閥組成。出口壓力油引至主閥芯上腔和先導閥前腔，當出口壓力大于減壓閥的調定壓力時，先導閥開啟，主閥芯上移，減壓縫隙關小，減壓閥才起減壓作用且保證出口壓力為定值。

　　減壓閥與溢流閥的主要區別為：

　　(1)靜止狀態，減壓閥閥口常開，溢流閥閥口常閉;

　　(2)減壓閥控制出口壓力穩定，而溢流閥控制進口壓力穩定;

　　(3)減壓閥閥口隨出口壓力的升高而關小，溢流閥閥口隨進口壓力的升高而開大;

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