valving
n. 阀调；[机]装设阀门
v. 装阀（valve 的 ing 形式）
例句
Firstly there's the issue of valving.
首先有问题的汽门。
All necessary valving is included also.
所有所需要的瓣膜也包括在内。
Periodic pressure undulation may be incited by fast valving control.
使用快关调节阀控制能激励周期蒸汽压力脉动。
