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The driving mechanism of a solenoid valve differs from that of ordinary valves; it is activated by a coil, which means it can only be opened or closed, and the switching time is short. Electric valves are generally driven by motors; it takes some time for them to open or close, and they can handle analog signals, allowing for adjustment. It is somewhat related to self-acting control valves. Solenoid valves generally have a very low flow coefficient, as well as a very small operating pressure difference. For example, the flow coefficient of a solenoid valve with a diameter of 25 is much lower than that of an electric ball valve with a diameter of 15. The solenoid valve is driven by an electromagnetic coil, and it is relatively prone to damage from voltage surges. It functions like a switch, with two modes: on and off. Electric valves are generally driven by motors, which are quite resistant to voltage surges. Solenoid valves can open and close quickly, and are generally used in applications with low flow rates and low pressures where a high switching frequency is required; electric valves are the opposite in this regard. The opening degree of an electric valve can be controlled; its states include open, closed, and half-open/half-closed, allowing for control of the flow rate of the medium in the pipeline, whereas solenoid valves cannot meet this requirement. Solenoid valves can generally be reset when the power is cut off, while electric valves require a reset mechanism to have this functionality. Solenoid valves are suitable for certain special process requirements, such as leakage issues or specific fluid properties, but they are relatively expensive. Electric valves are generally used for regulation; there are also those with on/off functionality, such as those at the end of fan-coil units.