proportional control valve

例句：

1. 1. The proportion ofwater in the mixture is crucial for the final product's quality.
   混合物中水的比例对最终产品的质量至关重要。
2. 2.The engineer used a proportional control valve to regulate the flow rate.
   工程师使用了一个比例控制阀来调节流量。
3. 3.The system requires precise adjustment of the proportional control valve to maintain optimal performance.
   该系统需要精确调整比例控制阀以保持最佳性能。