steam valve center piece

例句：

1. 1.The steam valve is a crucial part of the heating system.
   蒸汽阀是供暖系统的关键部分。
2. 2. The engineer carefully inspected the steam valve to ensure it was functioning properly.
   工程师仔细检查了蒸汽阀，确保其正常工作。
3. 3. The steam valve was replaced after the leak was fixed.
   泄漏修复后更换了蒸汽阀。