Multi-turn electric actuator is used to drive gate valve and other regulating valves need multi-turn. Linear travel electric actuator is used to drive single-seat or double-seat regulating valve, sleeve valve, high temperature high pressure or water supply and de super heating water regulating valves. SD series are safe and reliable with various types and specifications, high accuracy, complete functions, light weight, convenient assembling , debugging , operating and maintaining. SD series  comply with modern international standards. SD series are widely used for energy , metallurgy , petroleum , light industry , chemical industry , construction materials industry , etc. SD series bring the important effect into industry process measurement and control system.