The ZAZM series electric sleeve regulating valves accept DC current signals from regulating instruments to adjust the flow rate of the medium being regulated, maintaining the controlled process parameters at the set value. They are widely used in the production automation control of industrial sectors such as power, metallurgy, chemical industry, petrochemical industry, light industry, textile, and papermaking. The nominal bore size of this series ranges from 20 to 200mm, with nominal pressures of 1.0, 1.6, 4.0, and 6.4MPa. The operating temperature range is from -40℃ to 450℃, and the signal range is 0~10mA.DC or 4~20mA.DC. The electric single-seat regulating valve is suitable for low pressure differential, high medium viscosity, or slightly particle-containing conditions. The electric sleeve regulating valve is suitable for high pressure differential conditions. They are divided into metal-metal and non-metal-metal sealed types according to the material of the valve internal sealing part, with the latter achieving a leakage rate up to VI level (zero leakage) when the valve is closed. They can be divided into general packing seal and bellows seal according to the packing material, with the former used in general conditions and the latter in critical applications where external leakage is not allowed. The flow characteristics are linear or equal percentage. They are available in two types: standard and electronic, depending on the actuator used. A variety of types and sizes are available for selection.