
Metal Valves For Use In Flanged Pipe Systems - Face To Face And Centre To Face Dimensions. Part 2: Pn Designated Valves (pren 558-2)
出版:British Standards Institution

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Metal Valves For Use In Flanged Pipe Systems - Face To Face And Centre To Face Dimensions. Part 2: Pn Designated Valves (pren 558-2)
出版:British Standards Institution
专家解读视频