empty and load valve

例句：

1. 1. The engineers were busyinstalling the new empty and load valvesin the factory.
   工程师们忙于在工厂安装新的空载和加载阀门。
2. 2. The valves are essential for maintaining proper flow ofgases through the pipeline.
   阀门对于保持气体通过管道的适当流动至关重要。
3. 3. The engineers carefully checked each valve to ensure theywere functioning properly.
   工程师们仔细检查了每个阀门，确保它们正常工作。