活门的英文怎么说

活门的英文：
valve

Pack a valve stem.
扎好活门塞

Valve Disadvantages: The valve is difficult to close and requires the operator to double close the valve.
阀门的缺点:阀门难以关闭，要求操作者二次关闭阀门。

pilot valve governor
带伺服电动机的调节器辅助调速器

The valve has jammed shut.
阀门给卡住了打不开。

multiple leaf valve
多簧片阀

cooled anode valve
冷板屏极真空管