4WRDE 25 Rexroth Proportional Valve 220L/min 315Bar

Product Overview

The 4WRDE 25 V1-220L-5X/6L24K9WG152MR is a high-performance, pilot-operated 2-stage proportional directional valve equipped with Integrated On-Board Electronics (OBE). It is designed for high-precision flow and direction control in complex open-loop and closed-loop hydraulic circuits. Engineered to serve as a 100% direct drop-in replacement for original Rexroth valves, it delivers identical mounting footprints, electrical configurations, and hydraulic capabilities. Every unit undergoes 100% simulated working condition testing to guarantee maximum volumetric efficiency, superior dynamic response, and extended service life in heavy-duty industrial environments.

Technical Specifications

• Model Code: 4WRDE 25 V1-220L-5X/6L24K9WG152MR

• Nominal Size: NG25 (ISO 4401-08 / CETOP 08 mounting pattern)

• Nominal Flow: 220 L/min (at valve pressure drop $\Delta p = 10\text{ bar}$)

• Maximum Flow Capacity: Up to 650 L/min

• Max Operating Pressure (Ports A, B, P): 315 bar

• Max Tank Pressure (Port T): 210 bar (Internal drain) / 315 bar (External drain)

• Pilot Pressure Range: 15 bar to 210 bar

• Spool Symbol: V1 (4/3-way spool with symmetrical progressive characteristic)

• Control Architecture: Integrated On-Board Electronics (OBE), 24V DC supply, 6+PE pin connector

• Seal Material: FKM (Fluorocarbon seals, compatible with mineral oils and synthetic fluids)

• Target Fluid Cleanliness: ISO 4406 Class 18/16/13 (NAS 1638 Class 7)

• Approximate Weight: 14.0 kg

Key Technical Advantages

• 100% Drop-in Interchangeability: Precision-machined to match ISO 4401 international mounting standards and standard OEM wiring pinouts, allowing effortless replacement without piping or PLC code modifications.

• High Volumetric Efficiency: Ultra-precise matching tolerances between the main spool and valve body minimize internal oil leakage and ensure highly repeatable flow control under elevated working pressures.

• 100% Factory Simulated Testing: Tested on automated test rigs under simulated max operating pressure and frequency conditions prior to shipment to ensure zero-defect reliability.

• Low Noise Fluid Dynamics: Optimized internal flow geometry reduces turbulence, fluid shear, and pressure drops, lowering overall noise levels during high-flow operations.

Application Areas

• Metal Forming & Hydraulic Presses: Precision velocity and force control for bending machines, forging presses, and stamping systems.

• Plastics Machinery: Dynamic control of injection units and clamping mechanisms in injection molding and blow molding machines.

• Metallurgy & Heavy Industry: Reliable operation in steel rolling mills, continuous casters, and furnace hydraulic systems.

• Marine & Offshore Engineering: Precise drive control for shipboard cranes, winches, and offshore drilling rigs.

Expert Maintenance Tips

• Oil Cleanliness Control: Ensure system fluid cleanliness meets ISO 4406 Class 18/16/13 or better by installing a $10\,\mu\text{m}$ inline high-pressure filter to protect pilot spool tolerances.

• Pilot Air Bleeding: Thoroughly bleed all air trapped inside the pilot valve cavities using the top vent screws prior to initial full-pressure commissioning to prevent instability or lag.

• Electrical Shielding: Use twisted-pair shielded cables for 24V DC analog command signals and properly ground the shield to protect the integrated electronics from industrial electromagnetic interference.