Normally closed. Direct acting. No minimum differential pressure to operate.“Free handle” system, i.e., it closes automatically when current is cut off and opens manually when the electric signal is on.Injected or cast aluminium body. Buna “N” seat. DIN 43650 Connection encapsulated coils.IP65 and NEMA 4 Protection. Closed or open valve viewer.360º Rotating housing. Response time < 50 milliseconds.Core tube: 304 s.s. Core spring: 302 s.s. Core: 430 F s.s.Shading coil: copper.