Hi, this is COVNA Quarter-turn Electric actuator.
There are 3 types of control: ON/OFF Type, Regulation type and another Intelligent type with LED touchable screen.
By Regulation type and Intelligent type, you can use 4-20mA signal to control the opening degree.
Now you can see that we have a manual override function, which means that you can manually close it when power failure.
Besides, this actuator has standard ISO5211 mounting plating, which means that it can be easily mounted with ball valve or butterfly valve.
Last but not least, this actuator has maximum 4000 N.m torque.

www.china-covna.com