DBW20B2-5X/315U6EG24N9K4威格士减压溢流阀如在调整时出口压力高于设定压力，须从第一步开始重新调整，即只能从低压向高压调。
减压阀的作用原理是靠阀内流道对水流的局部阻力降低水压，水压降的范围由连接阀瓣的薄膜或活塞两侧的进出口水压差自动调节。定比减压原理是利用阀体中浮动活塞的水压比控制，进出口端减压比与进出口侧活塞面积比成反比。,

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