Bosch Rexroth | 4WRZ25W6-325-7X6EG24N9K4V
4WRZ25W6-325-7X/6EG24N9K4/V
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The 4WRZ25W6-325-7X/6EG24N9K4/V proportional directional valve is produced by Bosch Rexroth for the WRZ Proportional Directional Valves series. It modulates pilot and main flow to automate actuator speed and direction in hydraulic systems. The valve size of 25 provides a flow capacity suited to medium- to high-duty circuits. An ISO 4401 mounting interface allows direct installation on standard subplates, simplifying manifold design. The W6 spool variant defines the flow paths needed for bidirectional cylinder control. A 24 V DC supply voltage powers the integrated pilot stage so it can receive precise electrical commands. The DIN EN 175301-803 plug forms the electrical connection, giving quick coupling in harsh environments. Pilot control is handled by a size 6 valve, which supports compact servo performance while keeping overall dimensions moderate. External pilot oil supply and drain separate the control oil from tank return for stable dynamics, and a pilot oil flow of 7 l/min enables full stroke within the commanded time.
Under operating load the main stage passes up to 325 l/min at a pressure drop of 10 bar, allowing rapid cylinder movement in large machinery. The valve withstands a maximum operating pressure of 350 bar in the main ports, so it can be used on high-pressure power units without derating. A return pressure of 250 bar at port T permits remote tank routing while maintaining response accuracy, and port Y is limited to 30 bar to protect the pilot drain gallery. Mineral oil of the HL or HLP classes specified in DIN 51524 is the approved hydraulic fluid, ensuring compatibility with common industrial oils. FKM sealing material resists heat and additives, extending service life in continuous duty. A concealed manual override lets service staff shift the spool during commissioning without exposing moving parts. The assembled subplate version weighs 18.2 kg, which guides lifting and support requirements during installation.
Technical Specifications
Electrical Connection
DIN EN 175301-803 Plug
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Manual Override
Concealed
Max Operating Pressure (main)
350 bar
Max Pressure (port Y)
30 bar
Max Return Pressure (port T, Ext.)
250 bar
Mounting Interface
ISO 4401
Nominal Flow (Δp=10 Bar)
325 l/min
Pilot Oil Flow (0-100% Step)
7 l/min
Pilot Oil Supply/drain
External/External
Pilot Valve Size
6
Seal Material
FKM (V)
Spool Variant
W6
Supply Voltage
24 V DC
Valve Size
25
Weight (subplate, Size 25)
18.2 kg
1620 Old Apex Road
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