4WRZ10W6-85-7X/6EG24N9EK4/D3VP Rexroth Prop. Valve

Product Overview

The 4WRZ10W6-85-7X/6EG24N9EK4/D3VP is a Bosch Rexroth 4WRZ series pilot-operated proportional directional valve. It features a pilot stage driven by proportional solenoids that precisely positions the main spool to control flow direction and magnitude. With spool symbol W6 and a rated flow of 85 L/min, the valve is fully compliant with ISO 4401-05 mounting standards and offers true interchangeability as a drop-in replacement for original Rexroth units without manifold or piping modifications. Every unit undergoes precision machining and 100% simulated duty-cycle testing to ensure high response performance, stable proportional control, and long service life. Related series include 4WRA, 4WRAE, 4WRE, 4WREE, 4WRZE, 4WRK, and 4WRKE.

Technical Specifications 

• Model: 4WRZ10W6-85-7X/6EG24N9EK4/D3VP (Bosch Rexroth 4WRZ Series)
• Nominal Size: NG10 (ISO 4401-05-05-0-05)
• Spool Symbol: W6
• Rated Flow: 85 L/min
• Maximum Flow: 170 L/min
• Maximum Operating Pressure: Up to 350 bar (depending on configuration)
• Actuation: Pilot-operated proportional solenoids (external electronics required)
• Supply Voltage: 24 V DC (G24)
• Pilot Oil: Internal/external supply options, with D3 pressure reducing valve option
• Electrical Connection: EK4 standard connectors
• Weight: Approx. 7.8–8.2 kg
• Installation Position: Any (preferably horizontal)
• Ambient Temperature: –20°C to +80°C (depending on type)
• Filtration: Main valve ISO 4406 20/18/15; pilot valve higher cleanliness

Key Technical Advantages

1. Pilot-operated high-flow control – A low-power pilot stage precisely drives the main spool, enabling accurate proportional regulation of large flows with fast response and high control precision.
2. Optional D3 pressure reducing valve for stable pilot pressure – Ensures consistent pilot oil pressure, enhancing overall control reliability.
3. True interchangeability and standard interfaces – Fully compliant with ISO 4401 NG10 mounting pattern, enabling direct drop-in replacement of original Rexroth valves and minimizing system modification costs.
4. Precision machining and long service life – Precisely matched spool and housing, combined with 100% duty-cycle testing, deliver low leakage, high reliability, and extended service life.

Application Areas

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

Expert Maintenance Tips

Ensure manifold surface quality meets specifications and tighten mounting bolts to the correct torque; pilot oil requires higher cleanliness levels with strict filtration; periodically check free movement of the pilot and main spools; confirm external amplifier parameters match the valve; during extended downtime, energize the valve periodically to keep the spool lubricated. When equipped with the D3 pressure reducing valve, verify the pilot pressure setting.