The electric mid - line butterfly valve adopts an integrated structure, which is matched with the HL electric actuator. It can operate with the input of (4 - 20mADC, 0 - 10VDC or 1 - 5VDC) signal and single - phase power supply. It has the characteristics of strong functions, small size, light weight, cost - effectiveness, reliable performance, simple matching, and large flow capacity. This valve is widely used in industrial automation control systems in various industries such as food, environmental protection, light industry, petroleum, paper - making, chemical, teaching and research equipment, and electric power.