4WRA6W30-2X/G24K4/V

The 4WRA6W30-2X/G24K4/V proportional directional valve belongs to the 4WRA Proportional Directional Valves series and is manufactured by Bosch Rexroth for closed-loop hydraulic automation. It is built in nominal size 6 so it fits compact manifolds without exceeding standard flow envelopes. The valve uses subplate mounting, which permits rapid changeover during maintenance without disturbing pipework. A porting pattern of ISO 4401-03-02-0-05 aligns the pressure, tank, and work ports with commonly used CETOP 03 bases. Its ports have an 8 mm diameter, giving a passage that matches the rated flow for this size. Fastening is achieved with M5 × 50 screws conforming to ISO 4762 and property class 10.9. These screws must be tightened to 7 Nm with a tolerance of ±10 % to achieve reliable compression of the seals. The unit can be installed in any position, which supports flexible stack arrangements in multi-axis hydraulic blocks.

Electrical control is provided by a 24 V DC supply that enters through a K4 connector with two power poles and a protective earth. An IP65 protection class prevents dust ingress and guards the coil and spool position sensor against low-pressure water jets during wash-down. The sealing elements are made of FKM, designated by the suffix V, so they withstand common mineral oils and elevated operating temperatures. The allowable fluid temperature ranges from −20 °C to +70 °C, permitting cold-weather start-up and normal service heat. System oil should maintain a viscosity between 30 and 46 mm²/s for optimum proportional response, yet the design tolerates a broader span of 20 to 380 mm²/s when conditions vary. Hydraulic cleanliness must reach ISO 4406 (c) 20/18/15 to avoid spool sticking and premature wear. Together, these parameters define the operating envelope for consistent directional control in servo-quality circuits.