valve action

例句：

1. 1. The valve action of the pump is critical to its performance.
   泵的阀门动作对其性能至关重要。
2. 2. The valve action in this system is designed to prevent leaks.
   该系统中的阀门动作旨在防止泄漏。
3. 3. During valve action, the pressure increases rapidly.
   在阀门动作期间，压力迅速增加。