Pneumatic actuators are probably the most common type of actuator, because of their cheap and readily available power source, which is compressed air. ...
Actuator
Hydraulic Actuators
Hydraulic actuators are capable of delivering very high torques, and with it the fast stroking speed necessary to operate larger valves. ...
Electric Actuators
Modern electric motor powered actuators allow local, remote, and hand operation and they are available for a variety of types of valves and sizes. ...
Valve Operating Forces
Additional torque will be required in special cases such as dry gas, slurry, high velocity, high or low temperature, and infrequent use. ...
Types Of Actuators
The methods of valve actuation fall into one of the categories: Linear， Part-turn， Multi-turn；each of them can be powered by hydraulic, electric, or neumatic. ...