Full definition
Valve controlling fluid flow direction in hydraulic or pneumatic circuits. Port/position notation: 4/2 (4 ports, 2 positions), 4/3 (with center position), 5/2 (pneumatic). Actuation: solenoid 24VDC/110-220VAC, hydraulic/pneumatic pilot, manual, or mechanical. Standards: ISO 4401 (hydraulic mounting interface), ISO 5599 (pneumatic). Brands: Bosch Rexroth, Parker, Atos, SMC, Festo.