Multi-turn electric actuator is effective for linear stroke valves. These are necessary drives for opening / closing / adjusting valves, including globe valve, gate valve, etc. There is self-control, centralized-control, or remote-control device on the valves. The actuator has several advantages, such as multifunction, advanced control system, stable performance, compact size, light weight, simple operation and easy maintenance. It is widely practical in chemicals, oil, power, recycled paper, water treatment, metallurgy, and other industries.