What is the need for torque in an electric actuator?

Explain the requirement of torque in an electric actuator

There are two ways to set the open and close limits in MOVs, one is “by position” that is applicable in ball valves. The second is “by torque” MOV will consider its position by reaching the torque value set point. Torque is used in Gate valves. If by position is set in gate valves and there is any obstruction in the valve to reach its position, MOV will continuously force until it reaches its position or it will damage the valve by over forcing.