4WRLE 25V370M-3X/G24K0/A1M Rexroth Proportional Valve

Product Overview

The 4WRLE 25V370M-3X/G24K0/A1M is a heavy-duty, pilot-operated electro-hydraulic proportional directional valve engineered for high-flow hydraulic circuits demanding acute position and velocity control. As a globally recognized manufacturer of industrial hydraulic components, we have engineered this valve to serve as a 100% flawless drop-in replacement for the original Bosch Rexroth 4WRLE 3X component series. Incorporating precision pilot control and robust main spool position feedback, this valve ensures instantaneous dynamic response and accurate fluid routing under immense pressures. We guarantee that every single unit is rigorously validated on our specialized hydraulic test benches, subjected to 100% full-load simulated working conditions prior to dispatch. Choosing our interchangeable solution minimizes your procurement lead times and slashes maintenance budgets while guaranteeing zero-compromise, uninterrupted performance for your heavy machinery.

Technical Specifications 

• Model Number: 4WRLE 25V370M-3X/G24K0/A1M

• Brand Compatibility: 100% Interchangeable with Bosch Rexroth

• Mounting Standard: NG25 / CETOP 8 (ISO 4401-08-08-0-05)

• Nominal Flow Rate: 370 L/min (Based on a V-spool design at a 10 bar pressure drop)

• Max Working Pressure: 350 bar for main ports (P, A, B); 250 bar for return port (T)

• Max RPM: Not applicable (Stationary electro-hydraulic directional valve)

• Control Type: Pilot-operated proportional control with closed-loop main spool position feedback

• Solenoid Supply Voltage: 24V DC (G24)

• Electrical Connection: K0 (without mating plug; standard DIN connectors required)

• Seal Material: M-type NBR (Nitrile Butadiene Rubber) for optimal mineral oil compatibility

• Fluid Temperature Range: -20°C to +80°C

• Net Weight: Approx. 18.5 kg

Key Technical Advantages

• Absolute Drop-In Interchangeability: Manufactured strictly adhering to the 3X series dimensional blueprints. The porting patterns, bolt spacing, and mounting flanges are identical to the OEM component, allowing maintenance crews to execute plug-and-play replacements without any pipework modifications.

• Exceptional Closed-Loop Accuracy: Equipped with a high-fidelity inductive position transducer to monitor the main spool’s absolute position. Synchronized with the pilot valve’s micro-adjustments, it effectively neutralizes flow forces and friction, delivering exceptionally low hysteresis (≤ 1%) and excellent repeatability for servo-grade applications.

• 100% Rigorous Simulated Testing: No random batch sampling. Every valve undergoes dynamic directional switching, flow step-responses, and sustained pressure-holding tests at a full 350 bar load. This eradicates the risk of out-of-the-box internal leakage or high-temperature spool sticking.

• Aerospace-Grade Hardening & Flow Optimization: The core main spool is constructed from high-strength carburized steel with micron-level grinding. The internal V-notch flow channels are optimized via CFD (Computational Fluid Dynamics) to minimize hydrodynamic noise and withstand severe cavitation at high flow rates.

Application Areas:

Engineered for immense flow handling and robust pressure endurance, the 4WRLE 25 is heavily deployed in:

• Hydraulic screw-down and leveling control systems in heavy continuous casting and hot/cold rolling metallurgical mills.

• Main cylinder velocity, direction, and pressure modulation circuits in large-scale servo-presses and forging machines.

• Clamping and injection axis control in heavy-duty plastic injection molding and premium die-casting machinery.

• Precision luffing and hoisting controls in marine offshore equipment and heavy lifting winches.

Expert Maintenance Tips

• Stringent Pilot Fluid Cleanliness: The pilot proportional valve operates with microscopic spool clearances, making it highly sensitive to particulate contamination. Fluid cleanliness in both the main and pilot circuits must be maintained at ISO 4406 Class 18/16/13 or better. Regular replacement of high-precision return or pressure line filters is strongly advised.

• Confirm Pilot Oil Routing: Prior to installation, verify your system’s required pilot oil configuration (e.g., internal pilot/internal drain, external pilot/internal drain). This can be adjusted by adding or removing internal threaded plugs between the X and Y ports. Incorrect configurations will cause switching failures or sluggish response times.

• Initial Startup & Air Bleeding: When commissioning the valve for the first time, operate the system at a low pressure and slightly loosen the bleed screws on the pilot valve. Continue bleeding until the hydraulic fluid emerges completely clear and free of bubbles. Entrapped air will induce systemic judder and compromise positioning accuracy.