position selector valve

例句：

1. 1. The position of the valve is criticalfor the proper functioning of the system.
   阀门的位置对于系统的正常工作至关重要。
2. 2. The engineer carefullyselected the position of the valve to ensureoptimal performance.
   工程师仔细选择了阀门的位置，以确保最佳的性能。
3. 3. The position of the valve wasadjusted to accommodate the changing flow requirements.
   阀门的位置被调整以适应流量变化的需要。