gravity-held check valve

例句：

1. 1.The gravity-held check valve prevents the flow of fluid from one side to the other.
   重压保持的止回阀防止了流体从一侧流向另一侧。
2. 2.The engineer used a gravity-held check valve to ensure proper sealing during the installation process.
   工程师使用重力保持的止回阀来确保安装过程中的密封正确。
3. 3.The gravity-held check valve was designed to handle high pressure and maintain a stable flow rate.
   重力保持的止回阀被设计用来处理高压并维持稳定的流量。