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Self-operated control valve is a kind of intelligent valve that does not need external power and automatically adjusts the flow and pressure through the medium's own pressure, which is widely used in a variety of working environments such as heating, HVAC, water supply and drainage, chemical industry and petroleum, etc. The valve is suitable for water, steam, air and some corrosive media. The valve is suitable for water, steam, air and some corrosive media, with good sealing performance and corrosion resistance. Self-operated control valves rely on the media pressure difference to automatically adjust the spool position, to achieve accurate flow and pressure control, without power or gas source, easy to operate and energy saving and environmental protection. Advantages of the product include simple structure, easy maintenance, sensitive response, stable regulation, suitable for remote or unattended places. Its function not only covers the automatic adjustment of flow, but also effectively protects the pressure of the pipeline network and ensures the safe operation of the system. Due to its high efficiency, energy-saving and intelligent features, the self-operated control valve has become an important equipment for the automated adjustment of modern industrial and municipal pipeline networks.