Automated valves can be classified based on there actuation method. There are many ways to actuate a valve however generally used methods are listed below.

Pneumatic –

• Valves which are operated using Air or gas pressure are called Pneumatic valves.
• In case of linear valve air pressure acts on the obturator creating linear pressure.
• In case of rotary valve air pressure generates torque to provide rotary motion.
• Availability of compressed air on the site is the most important factor while going for pneumatically actuated valves.

Electric –

In case of electrically actuated valves, electric motors are used. Here availability of electricity at the site becomes major deciding factor.

Hydraulic –

• Hydraulic actuators use fluid pressure to actuate the valve.
• In case of linear valve, fluid pressure acts on a piston providing a linear thrust.
• In case of rotary valve it provides the torque for rotary motion.