Control solenoid valves's Summary:

4V series control solenoid valves have 5/2 and 5/3 types, size from M5 to 1/2", while 5/2 typs have single solenoid type and double solenoid type, Single solenlid valves is repositioned by the spring, and the double solenoid vavle is repositioned by the coil. 5/3 type solenoid valve can make the cylinder piston stop at any position.  

Control solenoid valves's Specifications:

Control solenoid valves's model and size: