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With the development of the natural gas business, the supply demand for natural gas valves is increasing. In order to adapt to market competition, valve manufacturers continue to introduce new products.

China's current buried gas valve structure is divided into gate valve, ball valve, butterfly valve and so on. The valve transmission modes mainly include manual, worm gear, electric, pneumatic, and liquid-gas linkage. The installation methods of special gas valves include the need to build gate wells and the direct-buried type.

Relevant data show that artificial gate valves are the most widely used in urban coal-to-gas transportation systems. In Tianjin, the length of medium-pressure pipelines in Hebei, Hongqiao, and Beichen is more than 120km, and the valve length is more than 300km. Solenoid valve manufacturers account for more than 80%, followed by butterfly valves and ball valves.

The gas pipelines in the above three areas were all artificial gas before the implementation of the gas source conversion project. There are many impurities in man-made gas, especially the "gas glue" formed by the mixture of tar, aromatic hydrocarbons and dust, which often affects the sealing of the valve, and even "bites" the valve stem. Therefore, in the selection of the valve, we mainly choose the valve that can solve this problem from the structural characteristics of the four-way solenoid valve, so as to ensure that the valve can be opened and closed flexibly and without leakage.

Through years of practice and data analysis, we have found that gate valves are more suitable, including parallel double gate valves and elastic sealing single gate valves. However, with the end of the natural gas substitution project, the nature of natural gas is also changing.

Compared with coal-based gas, coal-based gas is cleaner, drier, and drier, but because it contains sandy dust, the pressure is greater. Therefore, under high pressure, sand dust will have a strong impact on the inner cavity of the gas valve. Erosion, and natural gas contains hydrogen sulfide, so how to choose the valve on the urban underground pipeline is a new topic before us.