5/2 & 4/2-Way Pneumatic Valve - How They Work | Tameson.com
Directional control valves: 5/3- way single solenoid valve, closed in mid-position, actuation in both directions by solenoids with one winding and pneumatic piloting. Mid-position spring-centred, manual override in both directions - Valves -
5/3 Way Double Solenoid Valve 3 Position - Airmax Pneumatics