“pressure vacuum valve”的概念、定义、翻译、参考文献-科学参考

单词	pressure vacuum valve
释义	pressure vacuum valve Encyclopedia 工学锅炉阀门释 pressure vacuum valve压力真空阀维护压力容器气压平衡，减少介质挥发的安全节能装置。由压力阀和真空阀两部分组成。又称呼吸阀、PV阀。
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