steam gauge cock

例句：

1. 1.The engineer used a steam gauge to check the pressure in the boiler.
   工程师使用蒸汽计检查锅炉中的压力。
2. 2. The steam gauge cock was adjusted to ensure accurate readings.
   调整蒸汽计的阀门以确保准确的读数。
3. 3.The steam gauge cock was found to be faulty and needed replacement.
   发现蒸汽计的阀门有故障，需要更换。