4WRZE25E1-325-7X/6EG24N9ETK31/A1D3M Rexroth Valve

Product Overview

The 4WRZE25E1-325-7X/6EG24N9ETK31/A1D3M is a Bosch Rexroth 4WRZE series pilot-operated proportional directional valve with integrated on-board electronics (OBE). This two-stage proportional valve precisely controls the direction and magnitude of oil flow. Size NG25, nominal flow 325 L/min (at Δp=10 bar), maximum operating pressure 350 bar and maximum flow approximately 870 L/min. It offers true interchangeability as a drop-in replacement for original Rexroth units without manifold modifications. Every valve undergoes precision machining and 100% simulated duty-cycle testing to ensure high dynamic response, low hysteresis and reliable performance. The series also includes 4WRAE, 4WRAP, 4WREE and 4WRZ variants.

Technical Specifications 

• Model: 4WRZE25E1-325-7X/6EG24N9ETK31/A1D3M (Bosch Rexroth 4WRZE Series)
• Nominal Size: NG25 (ISO 4401-08)
• Spool Symbol: E1
• Nominal Flow: 325 L/min (at Δp=10 bar)
• Maximum Operating Pressure: 350 bar
• Maximum Flow: Approx. 870 L/min
• Actuation: Pilot-operated proportional solenoids with integrated electronics (OBE)
• Supply Voltage: 24 V DC (G24)
• Command Signal: A1 (±10 V)
• Electrical Connection: K31 (DIN EN 175201-804)
• Manual Override: N9 (concealed)
• Additional Feature: D3 (with pressure reducing valve)
• Seal Material: NBR (M)
• Weight: Approx. 18–20 kg

Key Technical Advantages

1. Pilot-operated proportional control – Two-stage design enables precise high-flow control with excellent dynamic response.
2. Integrated OBE electronics – Built-in amplifier allows direct command-signal connection for simplified installation and commissioning.
3. True interchangeability and standard interfaces – Fully compliant with ISO 4401 mounting pattern, enabling direct replacement of original Rexroth valves.
4. Precision machining and high-pressure capability – Rated to 350 bar, verified by 100% duty-cycle testing for long-term stability and reliability.

Application Areas

Ideal for large injection molding machines, die-casting equipment, hydraulic presses, metallurgical plants, marine hydraulic systems and any industrial hydraulic application requiring high-flow precise directional and flow control.

Expert Maintenance Tips

Ensure the manifold is clean and flat and tighten bolts to the specified torque; make reliable electrical connections with proper earthing; maintain fluid cleanliness at ISO 4406 18/16/13 or better; periodically check pilot oil circuits and response; confirm command-signal zero point on first power-up; after prolonged storage, energize the valve to verify operation.