The majority of these mechanical valves are functioned on pipes of the industry of oil industry, gas industry, mining industry, water and sewage industries, as well as every household. Generally speaking, the valves settled in the household seem to be simple and easy controlled or automated by level switches. They are possibly most of the manual ball valves. You can just use or turn of a handle or wheel to control valves. Referring to the large scale industry, valves operated automatically or worked by external input are normal. Maybe we can regard it as the development of the whole society. The actuator does a great help under the process.

The various types of valves reach the various requirements. The basic types are ball valve, check valves, butterfly valve, knife gate valves, solenoid valves control valves and so on. Their functions vary as they are mainly divided into throttle valves and actuated valves. It is distinguished by the control capacity whether it opens and closes or partially obstructs the flow. It should be mentioned that the strict obey to the their specification is quite important. Except the basic types, some special designed ones worth attention, too. Vacuum delay valve is one of them which is operated by delaying a vacuum signal. It is widely used in automobile cars.

If you think it as a whole valves world only in industry and household, you are wrong. If I tell you that some are used in our body, even the heart, to perform. They work to maintain blood pressure by closing and opening depending on the pressure of each side. Since they are so closely related with our life. Having a good knowledge of the basic mechanics can benefits a lot.

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