Butterfly valves, sizes 8 "and larger, when used on liquids, show a marked increase in dynamic torque which tends to close the valve."
对于公称通径大于8英寸的蝶阀，如果是在液体中使用，则在关闭阀门时，动态扭矩有比较明显的增加。
As a scale cover on the water regulating valve cover is marked with scales, by matching with a standard rod, the regulated position of the water regulating valve cover at each time can be known.
调水阀盖上的刻度盖标有刻度，配合标准杆，就可以知道每次调水阀盖所调的位置。
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