Bosch Rexroth | 4WRZE25W8-325-7X6EG24N9K31A1V
4WRZE25W8-325-7X/6EG24N9K31/A1V
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The 4WRZE25W8-325-7X/6EG24N9K31/A1V valve is produced by Bosch Rexroth within the WRZ Proportional Directional Valves series. It modulates actuator speed and direction in hydraulic automation by varying spool position according to an electronic command. The W8 spool symbol defines the four-way flow paths and center position selected for cylinder applications. A nominal flow rate of 325 l/min at a 10 bar pressure drop supports fast stroke times on presses and injection machines, while a maximum operating pressure of 350 bar allows installation in high-pressure systems without derating. The return port T can tolerate 250 bar when an external drain is routed, and the Y pilot drain is limited to 30 bar to protect the pilot stage from excess back pressure. The valve attaches to manifolds using the ISO 4401-08-07-0-94 porting pattern, ensuring dimensional interchange with other NG25 units. Its mass of 18.4 kg influences bracket sizing and handling equipment during maintenance.
Electrical control is based on a 24 V DC supply to the solenoid and a ±10 V command signal that the amplifier converts into proportional spool movement for precise flow regulation. The coil displays a resistance of 2 Ω at 20 °C, which defines the steady-state current and helps determine driver sizing, and it can tolerate winding temperatures up to 150 °C before insulation limits are reached. A DIN EN 175201-804 (K31) plug furnishes the electrical interface, and the housing achieves IP65 so the unit resists dust and water jets found in industrial wash-down areas. FKM seals retain mineral-oil hydraulic fluids of the HL and HLP classes, granting chemical stability under elevated temperature service. A concealed manual override designated N9 permits local actuation during commissioning or power losses without exposing the mechanism to dirt.
Technical Specifications
Command Signal
±10 V
Electrical Connection
DIN EN 175201-804 (K31)
Hydraulic Fluid
Mineral Oil (HL, HLP)
Manual Override
Concealed (N9)
Max Coil Temperature
150 °C
Max Operating Pressure (main)
350 bar
Max Port Y Pressure
30 bar
Max Return Port T Pressure (ext. Drain)
250 bar
Nominal Flow (Δp 10 Bar)
325 l/min
Porting Pattern
ISO 4401-08-07-0-94
Protection Class
IP65
Seal Material
FKM
Solenoid Coil Resistance (20 °c)
2 Ω
Spool Symbol
W8
Supply Voltage
24 V DC
Weight
18.4 kg
1620 Old Apex Road
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