Bosch Rexroth | 4WRZ25W8-325-7X6EG24N9K4D3V
4WRZ25W8-325-7X/6EG24N9K4/D3V
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The 4WRZ25W8-325-7X/6EG24N9K4/D3V valve belongs to the WRZ Proportional Directional Valves series manufactured by Bosch Rexroth for precise hydraulic actuation. It delivers a nominal flow of 325 l/min at a 10 bar pressure drop, allowing fast cylinder or motor movement in medium-to-high volume circuits. A maximum operating pressure of 350 bar lets the spool handle high-pressure supply lines without fatigue. The 25 mm port diameter on A, B, and T passages accommodates this flow while keeping velocity within acceptable limits. Its ISO 4401-08-07-0-94 mounting pattern aligns with common subplates so installers can exchange components without re-machining manifolds. A 24 V DC supply drives the solenoid; the cold coil resistance of 4.8 Ω sets initial current draw, and the design caps steady-state current at 1.5 A to match typical PWM amplifiers.
The hot coil resistance rises to 7.2 Ω, limiting current as temperature increases and helping the winding stay below its 150 °C maximum rating. The solenoid is rated for a 100 % duty cycle, so it can remain energized continuously during closed-loop control tasks. A 15 % command value overlap establishes a centered deadband that prevents unintended spool motion when the control signal hovers around zero. Electrical connection is made through a DIN EN 175301-803 plug, simplifying field wiring and seal replacement. An IP65 enclosure keeps dust and low-pressure water jets away from the coil cavity for reliable service outdoors or in wash-down zones. Return pressure limits of 250 bar at port T and 30 bar at port Y protect the tank and pilot drain circuits from back-pressure-induced leakage. The unit weighs 18.2 kg in subplate mounting, so support brackets or lifting aids may be required during installation.
Technical Specifications
Coil Resistance (cold, 20 °c)
4.8 Ω
Coil Resistance (max Hot)
7.2 Ω
Command Value Overlap
15 %
Duty Cycle
100 %
Electrical Connector
DIN EN 175301-803
Ingress Protection
IP65
Max Coil Current
1.5 A
Max Coil Temperature
150 °C
Max Operating Pressure
350 bar
Max Return Pressure (port T)
250 bar
Max Return Pressure (port Y)
30 bar
Mounting Pattern
ISO 4401-08-07-0-94
Nominal Flow (10 Bar Pressure Drop)
325 l/min
Port Diameter (a, B, T)
25 mm
Supply Voltage
24 V DC
Weight (subplate Mounting)
18.2 kg
1620 Old Apex Road
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