4WREE6E08-2X/G24K31/A1V Rexroth Proportional Valve 8L/min

Product Overview

The 4WREE6E04-2X/G24K31/A1V and 4WREE6E08-2X/G24K31/A1V are Bosch Rexroth 4WREE series direct-operated proportional directional valves. Equipped with electrical position feedback and integrated on-board electronics (OBE), they precisely control the direction and magnitude of flow. The spring-centered spool (symbol E) delivers rated flows of 4 L/min or 8 L/min at Δp = 10 bar. Fully compliant with ISO 4401-03 mounting standards, these valves offer true interchangeability as drop-in replacements for original Rexroth units without manifold or piping modifications. Every unit undergoes precision machining and 100% simulated duty-cycle testing to ensure high response sensitivity, low hysteresis, and stable proportional performance, ideal for low-flow high-precision applications.

Technical Specifications 

• Model: 4WREE6E04-2X/G24K31/A1V / 4WREE6E08-2X/G24K31/A1V (Bosch Rexroth 4WREE Series)
• Nominal Size: NG6 (ISO 4401-03-02-0-05)
• Spool Symbol: E (symmetrical)
• Rated Flow (Δp = 10 bar): 4 L/min or 8 L/min
• Maximum Flow: 80 L/min
• Maximum Operating Pressure: Ports P, A, B 315 bar; Port T 210 bar
• Actuation: Proportional solenoids with electrical position feedback and integrated electronics (OBE)
• Supply Voltage: 24 V DC (G24)
• Command Signal Interface: A1 (±10 V)
• Electrical Connection: K31 (DIN EN 175201-804, 7-pole connector)
• Seal Material: FKM (V code)
• Weight: Approx. 2.4 kg
• Installation Position: Any (preferably horizontal)
• Ambient Temperature: –20°C to +50°C
• Filtration: ISO 4406 20/18/15 (recommended)

Key Technical Advantages

1. Integrated OBE with closed-loop position feedback – Built-in electronics and electrical position sensing deliver hysteresis as low as 0.1% and high response sensitivity for precise proportional flow control.
2. Efficient direct-operated design – No pilot oil required; compact construction provides stable output at low pressure drop, ideal for low-flow high-precision applications.
3. True interchangeability and standard interfaces – Fully compliant with ISO 4401 NG6 mounting pattern, enabling direct drop-in replacement of original Rexroth valves and minimizing system modification costs.
4. Reliable spring centering and long service life – Spring-centered spool combined with precision manufacturing and 100% duty-cycle testing ensures stable long-term operation and high MTTF.

Application Areas

Ideal for precision machine tools, test stands, small hydraulic servo systems, auxiliary circuits on bending machines, injection molding auxiliary control, and any low-flow industrial closed-loop hydraulic system requiring precise position or velocity control.

Expert Maintenance Tips

Ensure manifold surface quality meets specifications and tighten mounting bolts to the correct torque; lock the electrical connector properly and verify protective earth; maintain fluid cleanliness at ISO 4406 20/18/15 or better; periodically check position feedback signals and amplifier parameters; confirm command-signal zero point before first power-up; during extended downtime, energize the valve periodically to keep the spool lubricated.