Bosch Rexroth | 4WRZ25W6-220-7X6EG24N9EK4V
4WRZ25W6-220-7X/6EG24N9EK4/V
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The 4WRZ25W6-220-7X/6EG24N9EK4/V valve belongs to the WRZ Proportional Directional Valves series manufactured by Bosch Rexroth and regulates hydraulic flow in automated machinery. It delivers a nominal flow of 220 l/min when the pressure drop across the ports is 10 bar, supporting fast actuator movement. The main stage tolerates operating pressures up to 350 bar, so it fits high-pressure circuits such as presses and die-casting systems. A subplate interface following ISO 4401-08-07-0-94 secures the housing, and the assembly weighs 18.2 kg in that mounting configuration. Electrical actuation is provided by a 24 V DC coil that draws no more than 1.5 A; its resistance measures 4.8 Ω at 20 °C, allowing current to be calculated accurately. Continuous operation at a 100 % duty cycle lets controllers modulate the spool without enforced cool-down periods, maintaining consistent response in closed-loop hydraulic automation.
Under sustained load the coil may reach 150 °C, at which point its resistance rises to 7.2 Ω, information used when sizing power electronics for thermal stability. Connection is made through a DIN EN 175301-803 plug that seals to an IP65 protection level against dust ingress and low-pressure water jets. Maximum hysteresis of 6 % keeps flow deviations small when the control signal reverses, aiding precise positioning. FKM seals withstand common hydraulic fluids and elevated temperatures to reduce leakage and extend service life. The external drain on port T can handle 250 bar, whereas port Y is limited to 30 bar to protect the pilot stage. These pressure boundaries, together with the stated electrical and environmental ratings, allow the valve to deliver repeatable proportional control in demanding servo-hydraulic applications.
Technical Specifications
Coil Resistance (20 °c)
4.8 Ω
Coil Resistance (max Hot)
7.2 Ω
Duty Cycle
100%
Electrical Connection
DIN EN 175301-803
Max Coil Temperature
150 °C
Max Current
1.5 A
Max Hysteresis
6%
Max Operating Pressure (main)
350 bar
Mounting Pattern
ISO 4401-08-07-0-94
Nominal Flow (Δp=10 Bar)
220 l/min
Port Y Pressure
30 bar
Return Port T Pressure (ext Drain)
250 bar
Seals
FKM
Supply Voltage
24 V DC
Type Of Protection
IP65
Weight (subplate Mounting)
18.2 kg
1620 Old Apex Road
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