Bosch Rexroth | 4WRAB6W25-1XG24N9K4MR
4WRAB6W25-1X/G24N9K4/MR
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The 4WRAB6W25-1X/G24N9K4/MR is a proportional directional valve from Bosch Rexroth in the 4WRA Proportional Directional Valves series, intended to meter flow and direction in servo-controlled hydraulic circuits. It uses spool symbol W to create the required flow paths and delivers a nominal flow of 25 L/min at a 10 bar pressure drop, while permitting a maximum flow of 30 L/min when higher capacity is needed. The unit mounts on an ISO 4401-03 (NFPA D03) interface, so it can replace standard D03 valves without adapter plates. A 24 VDC supply that may vary by ±10 % energizes the coil, whose resistance is 19.2 Ω at 20 °C; this combination limits current to a maximum of 1.25 A and holds electrical power to 30 W. Connection is achieved through a 3-pole DIN 43650 plug, and an NBR seal set contains hydraulic fluid in systems that handle mineral oils. A covered manual override labeled N9 lets maintenance personnel shift the spool without power during commissioning or troubleshooting.
The valve achieves a 0–100 % switching time of 18 ms, supporting quick actuator position changes in closed-loop control tasks. Its small-signal frequency response reaches 24 Hz at the −3 dB point, providing stable modulation for rapidly varying commands. Mechanical hysteresis does not exceed 3.5 %, which keeps flow output proportional to coil current over repeated cycles. Ports a, b, and p can be pressurized continuously up to 350 bar, while the t port tolerates back-pressure up to 210 bar, allowing the unit to work in high-pressure transmissions and test stands. When installed within these limits, the proportional spool follows input current precisely, enabling smooth speed and force regulation in hydraulic cylinders and motors without the discrete steps typical of on/off directional valves.
Technical Specifications
Coil Resistance (20 °c)
19.2 Ω
Electrical Connection
DIN 43650 (3-pole)
Frequency Response (−3 Db)
24 Hz
Hysteresis (max)
3.5%
Manual Override
Covered (N9)
Max Current (g24)
1.25 A
Max Flow
30 L/min
Max Power
30 W
Max Pressure (t)
210 bar
Mounting Interface
ISO 4401-03 (NFPA D03)
Nominal Flow (Δp 10 Bar)
25 L/min
Operating Pressure (a/b/p)
350 bar
Seal Material
NBR
Spool Symbol
W
Supply Voltage
24 VDC (±10%)
Switching Time 0–100%
18 ms
1620 Old Apex Road
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