Solenoid Valves Normal Close and Two-channel trait,acted as pilot valve. Popular used in liquid refrigerants or exhausting air Solenoid ValvesSV series Solenoid Valve is a kind of normally closed, two-channel trait ,acted as a pilot valve, it usually is applied in the liquid refrigerant or exhausting air and water or compressing air, with the features as below: Nut system with O ring ensures ...