Bosch Rexroth | 4WRZ25W6-325-7X6EG24N9EK4D3M
4WRZ25W6-325-7X/6EG24N9EK4/D3M
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The 4WRZ25W6-325-7X/6EG24N9EK4/D3M valve belongs to the WRZ Proportional Directional Valves series produced by Bosch Rexroth for hydraulic automation that requires adjustable flow direction and magnitude. It handles a nominal flow of 325 l/min at a differential pressure of 10 bar so actuators can move at high speed with stable control. The main stage tolerates operating pressures up to 350 bar, and the external return line may reach 250 bar without affecting function. Mineral oil conforming to DIN 51524 types HL or HLP is the approved hydraulic medium, with a viscosity window of 20 to 380 mm²/s to maintain film strength across operating conditions. Allowed fluid temperature spans −20 to +80 °C, supporting cold starts and elevated reservoir temperatures. The porting pattern follows ISO 4401-08-07-0-94, enabling direct mounting on standard subplates. Electrical actuation requires a 24 V DC supply delivered through a DIN EN 175301-803 plug coded K4, and a concealed manual override marked N9 permits local shifting when power is unavailable.
The pilot arrangement of the 4WRZ25W6-325-7X/6EG24N9EK4/D3M maintains tighter cleanliness, meeting ISO 4406 class 18/16/13, while the main path is satisfied with 20/18/15, so filtration stages can be matched to each circuit. Pilot oil can be supplied internally and drained externally under code E, giving designers flexibility when configuring manifolds. When driven from zero to full command, the pilot circuit draws 7 l/min and displaces 10 cm³, data that helps size pumps and control electronics. A pressure reducing cartridge ZDR 6 DP0-4X/40YM-W80 identified by D3 keeps the pilot pressure constant, ensuring the proportional solenoid positions the spool accurately. These features combine to produce consistent directional control performance even under variable load demands, linking the pilot logic to the main spool without external feedback hardware.
Technical Specifications
Cleanliness Class (main)
ISO 4406 20/18/15
Cleanliness Class (pilot)
ISO 4406 18/16/13
Electrical Connection
DIN EN 175301-803 Plug (K4)
Hydraulic Fluid
Mineral Oil (HL, HLP) DIN 51524
Hydraulic Fluid Temp Range
−20 to +80 °C
Manual Override
Concealed (N9)
Max Operating Pressure (main)
350 bar
Max Return Pressure (t, External)
250 bar
Nominal Flow (Δp = 10 Bar)
325 l/min
Pilot Oil Flow (0→100%)
7 l/min
Pilot Oil Supply/drain
Internal/External (E)
Pilot Oil Volume (0→100%)
10 cm³
Porting Pattern
ISO 4401-08-07-0-94
Pressure Reducing Valve
ZDR 6 DP0-4X/40YM-W80 (D3)
Supply Voltage
24 V DC (G24)
Viscosity Range
20 to 380 mm²/s
1620 Old Apex Road
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