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升降式止回阀

国标不锈钢升降式止回阀 http://www.cntgfm.com/shows/59/38.html

执行标准

设计制造: GB12235
结构长度: GB12221
连接法兰: JB/T79-1994
试验与检验: JB/T9092-1999

升降式止回阀插图

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