Norgren UM/22253/172/220VAC Pilot Operated Solenoid Valve | 220VAC The Norgren UM/22253/172/220VAC Pilot Operated Solenoid Valve is a reliable pneumatic control solution developed for industrial systems where controlled air management and dependable automated operation are essential. Designed around a pilot-operated principle, this valve provides an effective way to connect electrical control signals with pneumatic equipment, supporting stable machine sequences and efficient