flat seated valve

例句：

1. 1. The flat seated valve is designed to prevent air leakage during operation.
   这个平坐阀的设计是为了在操作过程中防止空气泄漏。
2. 2. The engineer carefully inspected the flat seated valve before installing it.
   工程师在安装前仔细检查了这个平坐阀。
3. 3.The flat seated valve was used in the construction of the bridge to ensure proper water flow.
   这个平坐阀被用于桥梁的建设中，以确保水流畅通。