Under what circumstances does an electric valve get damaged?
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I want to know how the motor stops once the electric valve is fully opened or closed; it would be great to have specific diagrams； Also, I would like to ask under what circumstances can an electric valve get damaged?
If stall occurs, it will get burned out.
There are limit switches for turning it on or off; if these switches fail, the motor keeps running, and if the overheat protection fails, the motor will burn out
The electric valve stops when the limit switch is activated after it has reached the fully open or fully closed position; therefore, the limit switch needs to be adjusted when calibrating the valve. If there is no limit and the motor keeps running, it will get damaged. However, the motor of the control valve is equipped with a thermal protection switch that activates when a certain temperature is reached, causing the motor to lose power and stop operating, thereby protecting the motor.
There are mainly three reasons for motor burnout: one is unstable voltage that fluctuates between high and low levels. Secondly, a malfunctioning limit switch causes stall, leading to a sharp increase in current and subsequent burnout. Third, the excessive torque of the associated valves causes the motor to operate under overload and burn out.
Intelligent electric actuators generally do not burn out the motor, as they have multiple protection mechanisms. In ordinary electric actuators, the motor can be damaged due to issues with the stroke or torque, errors in the control unit, or an inverted power supply
How can I determine if the motor of an electric valve is burned out? How to measure the motor resistance? How old?