valveless metering pump

例句：

1. 1.The valveless metering pump is used to control the flow of liquids.
   无阀计量泵用于控制液体的流动。
2. 2. The valveless metering pump is an essential tool for maintaining accurate measurements in industrial processes.
   无阀计量泵是工业过程中保持精确测量的重要工具。
3. 3. The valveless metering pump has been designed to operate efficiently and quietly, making it ideal for use in sensitive environments.
   无阀计量泵已被设计为高效且安静地运行，使其非常适合在敏感环境中使用。