Hydraulic control valves are mainly used for water and clean media, widely used in urban water supply and drainage, fire-fighting system and industrial circulating water system. It is suitable for normal to medium temperature working conditions, and the working temperature is generally within the range of 0℃ to 80℃. Its functions include automatic adjustment of flow, pressure and water level, to realize stable operation of the system and energy-saving control. Most of the valve body materials are ductile cast iron, stainless steel or copper alloy, and the seals are made of wear-resistant and corrosion-resistant rubber or polyurethane, which ensures stable performance and long service life of the valves and adapts to the demands of complex working conditions.