Solenoid valve is mainly to power as energy, the current through the drive electromagnetic coil electromagnetic force, and then the electromagnetic force through the control of the spring to control the valve. Of course, this spring can be used to control both the closing valve and the opening valve. So based on this property we can either have the coil not energized when the gas circuit is closed, which je običajno zaprt (n/c) tipa ventila ali pa tuljava ni mogoče energijo, ko je plinsko vezje odprto, kar je običajno odprt （n/o） Vtipka ventila .
