These are quarter turn gear actuators, suitable for ball valves, butterfly valves and plug valves etc. The housing is precisely cast, with fresh pattern and nice appearance. It transmitted by worm gear and worm, with self-locking function. Tapered roller bearing and thrust ball bearing combination makes the transmission more flexible and efficient. Max-torque of actuators matches with connecting flange standard, stem diameter and install height are all international standard. The connectting flange adapts to ISO.5211 makes it easy working with valves. Protection grade can be IP65, IP67, IP68 and Immersion mode according to customers requirements.