clapper valve

例句：

1. 1. Theengineers were busy installing the new clapper valve in the factory.
   工程师们忙于在工厂安装新的阀门。
2. 2. The oldclapper valve was replaced with amore efficient model.
   旧的阀门被更高效的模型所取代。
3. 3. The technician carefully checkedthe clapper valve to ensure itwas functioning properly.
   技术员仔细检查了阀门以确保其正常工作。