Metallic seal wafer butterfly valve 硬密封对夹式蝶阀
It's suitable to have shell test and seal test for flanged end butterfly valves and wafer type butterfly valves.
适用于法兰连接和对夹式蝶阀的强度和密封性能试验。
A seal may take the form of a piece of wax, a wafer or other substance affixed to the document or of an impression made on the document.
盖印的形式可以是封腊、封缄纸或者加付于文件上的物质，或者是在文件上加盖的印迹。
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