The DO series is Aventics' directional valve range covering individual mountable pneumatic valves for machine control circuits. 3/2 and 5/2 spool configurations with single solenoid, double solenoid, and spring-return functions cover the principal pneumatic control logic patterns. Multiple solenoid voltages and pilot options support OEM voltage standards. The DO platform is a practical individual-valve choice where standardized pneumatic actuation is needed without committing to a full manifold valve system.