The Series 581 (V581) is Aventics' ISO 5599-1 directional control valve platform — a global standard pneumatic valve family inherited from Rexroth Pneumatik. Configurations span 5/2 and 5/3 spool functions across ISO sizes 1, 2, and 3 with electrical, pneumatic, and manual pilot options. The V581 manifold platform integrates with the AV/HF valve systems and major fieldbus protocols, fitting standardized European and global machine-build pneumatic schemas.