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The line block valves are of vital importance for the safety operation of the pipeline.
线路截断阀是管道安全运行的重要保证。
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All valves to be suitable for double block and bleed service.
所有阀门需有双堵塞和双排放功能。
youdao
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All valves to be suitable for double block and bleed service.
所有阀门需有双堵塞和双排放功能。
youdao