对夹双瓣式止回阀（double disc wafer check valve）是一种通过 双阀瓣对合旋转 实现单向截流的阀门。 其结构采用 无螺栓对夹连接，直接由管道法兰压紧安装，适用于防止.
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1965 Chinese Zodiac Animal A Deep Dive Into Its Significance And Symbolism Clendr Customize Nd Print
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