“air-to-close”的概念、定义、翻译、参考文献-科学参考

单词	air-to-close
释义	air-to-close Chemical Engineering A type of pneumatically operated control valve that automatically opens in the event of a loss of instrument air pressure. An air-to-open valve is a pneumatically operated control valve that automatically closes in the event of a loss of instrument air pressure. For example, the fuel supply to a furnace should automatically shut on air failure.
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