The heating water level drain regulating valve consists of an electric actuator and a drain regulating valve. The input of the electric control valve is the DC electrical signal sent by the regulator, which is amplified by the servo amplifier and drives the actuator to generate axial thrust, driving the control valve to move and causing changes in the medium flow rate to regulate various parameters in the system. At the same time, the actuator sends a valve position signal for the servo amplifier to compare, so that the regulating valve always maintains a position corresponding to the input signal, completing the servo adjustment task.