Is a direct-operated, solenoid-controlled directional control valve, typically conforming to the. Standard for hydraulic systems. Based on typical Aron/Brevini part numbering, the code usually breaks down as follows. Size CETOP 5 (NG10). Specific spool configuration (commonly a 3-position, 4-way valve with all ports open). Used for controlling the start, stop, and direction of hydraulic flow in systems. Electrical solenoid (24 VDC). Subplate mounted, complying with ISO/CETOP standards.