... series Solenoid Valve is a kind of normally closed,two-channel trait,acted as a pilot valve, It usually is applied in the liquid ... is no need to shut systematic pipe line when replacing the electrom agnetic coilsThe valve can evaporate normally ,be opening or closing ... ,such as DANFOSS,CASTEL,PARKER,EMERSON,SAGINOMIYA and so on Solenoid Valve(Flare)