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

单词	back-pressure valve
释义	back-pressure valve [`bak ´presh·ǝr ´valv] ^{PETROLEUM ENGINEERING} A check valve installed in a natural- gas well bore to shut off gas flow while replacing the blowout preventer (used during drilling) with a christmas tree piping arrangement, which controls gas flow out of the completed well.
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