Solenoid valve: For the liquid and gas pipeline switch control, is two-bit do control.
Generally used in small pipe control. Electric valve: For liquid, gas and wind system piping medium flow of analog regulation, is AI control.
In the control of large valve and wind system can also use electric valve to do two-bit switch control.
Solenoid valve: Can only be used as a switch, is do control, only for small pipe control, common in DN50 and the following pipelines. Electric valve: Can have AI feedback signal, can be controlled by do or AO, compared to large pipes and wind valves.