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What is the design of a double-plate check valve without a fixing bolt?

2016-11-15View Original

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I saw a regulation stating that two-plate check valves used for flammable media should be designed without fixed plugs, or equipped with thread-fixed plugs that are sealed by welding. What kind of structure is that without fixed plugs? Does anyone know? Is the purpose of doing this to prevent unnecessary leaks at the location where the fixing bolt is installed?

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