The water supply pipe network will deliver tap water from the water plant to millions of households, so the water supply pipe network is located in every corner of the city. The water supply pipe network has a length of as few as several hundred kilometers and up to several thousand kilometers. The irreplaceability of water and the necessity of people's existence determine the importance of safe operation of water supply network. However, due to many subjective and objective reasons, the pipeline often has some faults, and the pipe network always needs to be constantly updated and rebuilt. The water users often have to increase or decrease accordingly. Therefore, the phenomenon of water stoppage in local pipe sections is unavoidable. In order to reduce the scope of no-go water, it is necessary to properly install the control valve in the pipe network. Therefore, in an urban water supply network, the number of valves is tens of thousands, and irregularly distributed in the city streets below. Valve is a kind of "keeping a thousand days for temporary" control equipment, usually require the valve to open in place to reduce the water loss of pipe. Once needed, the valve should be able to close quickly and flow reliably. Valve integrity, related to the valve selection, valve manufacturing, piping design, valve assembly, valve opening and closing operations and valve management, of course, the most important reason is the quality of the valve.