4WREE10E50-2X/G24K31/A1V Rexroth Proportional Valve 50L/min

Product Overview

The 4WREE10E50-2X/G24K31/A1V is a Bosch Rexroth 4WREE series direct-operated proportional directional valve. Equipped with electrical position feedback and integrated on-board electronics (OBE), it precisely controls the direction and magnitude of flow. The spring-centered spool (symbol E) delivers a rated flow of 50 L/min at Δp = 10 bar. Fully compliant with ISO 4401-05 mounting standards, the valve 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 sensitivity, low hysteresis, and stable proportional performance for medium-flow high-precision hydraulic systems.

Technical Specifications 

• Model: 4WREE10E50-2X/G24K31/A1V (Bosch Rexroth 4WREE Series)
• Nominal Size: NG10 (ISO 4401-05-04-0-05)
• Spool Symbol: E (symmetrical)
• Rated Flow (Δp = 10 bar): 50 L/min
• Maximum Flow: 180 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. 6.26–6.5 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 high flow capability at low pressure drop, ideal for medium-flow high-precision applications.
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. 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 injection molding machines, die-casting equipment, hydraulic presses, machine-tool feed systems, test stands, steel and metallurgical plants, and any medium-flow industrial closed-loop hydraulic system requiring precise position, velocity, or force 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.