Normal open solenoid valve i mekim olsem valv i stap op long olgeta taim, olsem na em i no i mas wokim bisan (energized). Taim enerdi i bin yusim, ol i kwiktaim i klos na i stap olsem olsem long wanem taim em i mas wokim bisan. Bikos bilong ol wei ol i klos, dispela ol valve i no i maski long yusim long long taim moa dan sampela hau. Ol i gutpela senis long ol sitwesen we valv i mas klos tasol long liklik taim, na i mas stap op long planti taim.
Nolmal Op (Normally Open) valve wok i gut long ol situison wanem i gat nid long keepim ol fluid i flai oltaim. Wanpela gutpela exempl (example) em i cooling tower bilong wanpela industri sistem we i mas always i stap long preventim overheating. Long dispela kaso, solenoid i save wok (long klosim valve) tasol taim i gat tru nid long klosim, olsem long taim maskiol (scheduled) maintenance o repa.
