mean of valve loop curve

例句：

1. 1. The engineer designed the valve to ensure smooth flow.
   工程师设计了阀门以确保流畅的流动。
2. 2. The valve loop curve plays a crucial role in maintaining system integrity.
   阀环曲线在维护系统完整性中起着至关重要的作用。
3. 3. During maintenance, the technician carefully inspected the valve loop curve for anysigns of wear.
   在维护期间，技术员仔细检查了阀门阀环，以寻找任何磨损的迹象。