Bosch Rexroth | 4WRZ25W8-325-7X6EG24N9ETK4D3M
4WRZ25W8-325-7X/6EG24N9ETK4/D3M
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The 4WRZ25W8-325-7X/6EG24N9ETK4/D3M proportional directional valve is manufactured by Bosch Rexroth in the WRZ Proportional Directional Valves series. It meters hydraulic flow and directs oil paths in automated motion circuits. With a nominal flow of 325 l/min at a 10 bar pressure drop, the unit can move high volumes to large actuators. A main stage pressure rating of 350 bar allows the valve to operate safely in high-pressure systems. The W8 spool profile defines the flow geometry so that accurate positioning is achieved. Internal pilot supply and drain simplify plumbing because no external pilot lines are required. The mounting face follows ISO 4401-08-07-0-94, enabling replacement on standard subplates. Return flow at port T may rise to 30 bar, which supports back-pressure controlled circuits. A 24 V DC solenoid feeds the proportional magnets, and wiring is completed through a DIN EN 175301-803 connector.
The valve maintains oil cleanliness to ISO 4406 class 20/18/15, limiting particle contamination that could jam the metering edges. Mineral oil of HL or HLP type is specified as the working fluid, ensuring compatibility with the sealing materials. Operation is permitted between –20 and +80 °C fluid temperature so the valve can run in typical mobile or industrial environments. Hysteresis is kept at or below 6 %, providing predictable spool position when the command signal is reversed. A concealed N9 manual override lets maintenance staff shift the spool without energizing the solenoid. NBR seals prevent external leakage and withstand the prescribed fluid range. The assembly weighs 18.2 kg, which installers must account for when designing support brackets.
Technical Specifications
Cleanliness Class (main)
ISO 4406 20/18/15
Electrical Connection
DIN EN 175301-803
Fluid Temperature Range
−20 to +80 °C
Hydraulic Fluid
Mineral Oil (HL, HLP)
Hysteresis
≤ 6 %
Manual Override
Concealed (N9)
Max Operating Pressure (main)
350 bar
Mounting Interface
ISO 4401-08-07-0-94
Nominal Flow (Δp 10 Bar)
325 l/min
Pilot Supply/drain
Internal/Internal
Return Pressure Port T (internal)
30 bar max
Seals
NBR (M)
Spool Type
W8
Supply Voltage
24 V DC
Weight
18.2 kg
1620 Old Apex Road
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