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。
Butterfly valves, sizes 8 "and larger, when used on liquids, show a marked increase in dynamic torque which tends to close the valve."
使用适量的焊料：如果使用线状焊料，那么对公称通径为3/4英寸的阀门就要采用3/4英寸的焊料，等等。
Use just enougn solder: with wire solder, use 3/4" for a 3/4" valve, etc. If too much solder is used, it may flow past tube stop and clog sealing area.
流道孔径与阀门公称通经，基本相同的为全通径式；流通孔径比阀门公称通经小的称为缩径式。
Nominal diameter and flow valves, basically the same breath for full-bore type, Circulation than nominal diameter valve is given. it small called non-reducing type.
流道孔径与阀门公称通经，基本相同的为全通径式；流通孔径比阀门公称通经小的称为缩径式。
Nominal diameter and flow valves, basically the same breath for full-bore type, Circulation than nominal diameter valve is given. it small called non-reducing type.
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