减压阀的构造类型很多，以往常见的有薄膜式、内弹簧活塞式等。减压阀的基本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
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一八七七一零二二八二九
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