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As we know a valve is a device that regulates the flow of substances (either gases, fluidized solids, slurries, or liquids) by opening, closing, or partially obstructing various passageways. The development of valves is closely related to the development of industry. And now they are used in a variety of applications including industrial, military, commercial, residential, transportation. Plumbing valves are the most obvious in everyday life, but many more are used. In a word valves are playing an important role in our life. And you can not fell the importance of valves until the accidents taken place. In much time the broken of valves will bring serious damage.

So what can we do to avoid the accidents caused by valves?

The fist thing many people will think out is that we should make new valves. The new ones must be more stable. In fact the development of valves has never stopped. On the one hand many new kinds of materials are used in valves and the structure of valves is also improved. On the other hand by combing computer technology with valves they have became more precise. But there is another thing many people forget. No matter how well a machine is, it still needs to be manipulated by people. In many times accidents are not caused by machines but by people. So we still need to improve the responsibility of the people who operate valves while we improve the quality of valves.