What components make up the motor operator used with a motor-operated valve?

The motor operator for a motor-operated valve consists primarily of a reversible driving motor and reduction gears. The reversible driving motor provides the necessary movement to open or close the valve by providing rotational force. The reduction gears play a critical role in this system by converting the high speed of the motor into a lower speed with increased torque. This is essential because valves require a significant amount of force to operate against the pressure of the fluids they control.

In this configuration, the reversible aspect of the motor allows it to turn in both directions, facilitating opening and closing movements for the valve. This combined action of the motor and the gears ensures that the valve operates efficiently, providing precise control and responsiveness tailored to the system's demands.

Other components mentioned in the options, such as an electric coil, control box, actuator, power supply, switch, and monitor, may play roles in valve operation or control systems but do not constitute the fundamental motor operator itself as defined in this context. Therefore, while they may be essential for the overall system functioning or cry for certain applications, the key elements driving the motor-operated valve mechanism specifically are the reversible driving motor and reduction gears.