coal gas recovery valve

例句：

1. 1. The coal gas recovery valve is crucial for preventing leakage during the extraction process.
   煤层气回收阀门在提取过程中防止泄漏至关重要。
2. 2. The engineers carefully inspected the coal gas recovery valve to ensure it was functioning properly.
   工程师们仔细检查了煤层气回收阀门，确保它正常工作。
3. 3. The safety of the coal gas recovery valve is a top priority in this operation.
   在这个操作中，煤层气回收阀门的安全是首要考虑的事项。