It is applicable to various fields such as petroleum, chemical industry, power, metallurgy, medicine, food, etc. It has been widely used in municipal, industrial water and wastewater treatment, as well as swimming pool water treatment. Dual-head performance and features: large flow rate, high discharge pressure, small adjustment ratio, stable state accuracy ±2%. At the same time, it can independently adjust the flow rate for two different media being transported or for transporting two different media simultaneously.