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When we use the tap, it is easy to open to the maximum directly, so that we often use the largest flow. But it is not necessary if we only wash our hands. In the same time, large flow can let go more water. It is a waste of water resources, therefore we think of a way to improve the tap.This is similar to the fan knobs, we want to set up stalls to control the flow of water, low flow is small and slow, high flow is large and fast. There are clear boundaries between the stalls, so gear can easily be determined when switching.This structure can save water resources.
Zhengjiang University,Hang Zhou,China