Lub zog hluav taws xob solenoid yog lub zog, tam sim no los ntawm kev tswj hwm lub valve thiab yog li lub caij nplooj ntoo hluav taws xob tau muab kaw thaum lub zog hluav taws xob tau kaw, uas ib txwm kaw (N / c) hom valve, lossis peb tuaj yeem muaj cov chev tsis energized thaum lub voj voos pa tawm, uas yog ib txwm qhib (n / o) hom valve {2}
