Rexroth 4WRPEH6 & 4WRPEH10 Replacement | Proportional Directional Valve

Genlu Hydraulic proudly introduces our premium 4WRPEH Series (encompassing high-response Size 6 and Size 10 platforms) direct-operated proportional directional valves with integrated electronics (OBE). This elite proportional valve infrastructure is masterfully engineered to fully match the rigorous design, response dynamics, and closed-loop accuracy standards of the classical Rexroth (Bosch Rexroth) 4WRPEH 2X series. It is custom-built to execute millisecond-level position, force, and flow (p/Q) profile regulation in sophisticated manufacturing automation and heavy mobile Carrier systems. Our advanced industrial production lineup flawlessly provides exact replacements for high-demand, long-code digital alphanumeric field setups, notably 4WRPEH 6 C3 B40L-2X/G24K0/A1M (Size 6) and 4WRPEH 10C4 B50L-2X/G24K0 (Size 10).

Serving as the technical “control brain” for premium plastic injection molding systems, metal forming machinery synchronizations, and heavy die-forging press matrix circuits, Genlu unequivocally guarantees 100% Drop-in Interchangeability in subplate mounting configurations (conforming to ISO 4401-03-02 for Size 6 and ISO 4401-05-04 for Size 10), primary oil port geometries, standard electrical 7-pin connector pin assignments, and exact frequency response curves relative to original Rexroth components. Backed by our uncompromising 100% Simulation Closed-Loop Testing, each proportional valve is validated under continuous rated pressure differentials to calibrate absolute midpoint overlapping, hysteresis, and flow linearity, ensuring drift-free precision over extended operational service loops.

Technical Specifications 

• Product Series: Rexroth 4WRPEH Direct-Operated High-Response Proportional Directional Valve with Integrated OBE

• Target Configuration Codes: 4WRPEH 6 C3 B40L-2X/G24K0/A1M, 4WRPEH 10C4 B50L-2X/G24K0

• Nominal Component Sizes: Size 6 denotes 6mm port pattern (ISO 4401-03) ；Size 10 denotes 10mm port pattern (ISO 4401-05)

• Primary Port Maximum Operating Pressure: 31.5 MPa (315 bar / 4500 psi)

• Maximum Allowed Nominal Flow Volumetrics: Up to 40 L/min for Size 6 ；up to 100 L/min for Size 10 (Calibrated at standard metric pressure drop $\Delta p = 1\,\text{MPa}$)

• Solenoid Power Supply Specification (G24): DC 24V (Permissible supply continuum ranges from 21V to 35V)

• Command Signal Input Framework (A1M): Differential voltage command 0 $\pm$ 10V (4 – 20mA current loop variants optional)

• Spool Control Matrix Functional Coding: C3 / C4 configurations providing zero-lap or minute pre-opening linear profiles

• Position Feedback Sensor Device: Built-in high-precision Linear Variable Differential Transformer (LVDT spool micro-travel sensor)

Key Technical Advantages:

• High-Dynamic Direct-Acting Proportional Solenoid Drive: The control spool is driven directly by high-force, low-hysteresis proportional solenoids, bypassing any auxiliary pilot fluid delays. Working in unison with the active current loop regulation inside the OBE module, this mechanism yields a full-stroke frequency response threshold exceeding 100Hz for high-speed dynamic tracking.

• Matched Spool-and-Sleeve Hardened Valve Matrix: The internal valve spool and sleeve assembly are forged from premium high-chromium tool steel (hardened to HRC 60 $\sim$ 62) and matched via nanoscale pairing procedures. Integrated pressure-balancing grooves reduce internal friction, restricting the total hysteresis metric to an exceptional $\le$ 0.1% threshold.

• Hermetically Sealed Integrated Smart OBE Electronics: The on-board electronics amplifier housing is directly secured to the cast aluminum valve side face, matching IP65 ingress protection ratings. The 7-pin electrical standard connector (Pin A through G) mirrors factory layouts. The built-in microprocessor implements adaptive high-gain PID processing, nullifying coil resistance drift caused by thermal variations.

• Zero-Lap Fluid Channel Geometries: The valve body layout incorporates smooth, cast fluid galleries designed to attenuate localized fluid turbulence, vortex generation, and acoustic stress. The zero-lap C3/C4 spool design combined with real-time LVDT loop feedback eliminates the “deadband lag” typical of standard directionals, achieving smooth actuator control.

Application Areas:

• High-Precision Plastic Injection & Blow Molding Fleets: Multi-stage proportional injection velocity and packing pressure profiling loops, and high-speed to low-speed mold clamp cushioning controls.

• Metal Forming & Heavy CNC Synchro Press Brakes: Precision position synchronization controls for dual hydraulic ram cylinders (Y1, Y2 axes) and primary servo-proportional control blocks for industrial stamping presses.

• Heavy Industrial Test Benches & Automated Handling Lines: Dynamic stroke/force synchronization for multi-axis hydraulic test actuators and proportional tilt controls for heavy metallurgical blast furnace distribution systems.

Expert Maintenance Tips:

• Enforce Uncompromising Oil Cleanliness to ISO 15/13/10 Parameters: Because the 4WRPEH series employs high-precision, micron-level clearances between the spool and sleeve matrix, it is highly sensitive to solid particulate pollution. Install a high-pressure inline finest filter with a rating of $\le 10\,\mu\text{m}$ and a high beta ratio directly upstream of the P-port; minor grit ingress will trigger immediate spool seizure.

• Verify Electrical 7-Pin Pin Assignments & Implement Shielded Grounding: The G24 proportional coil and internal OBE motherboard require a stable DC 24V rail. Use a twisted-pair cable with a braided shield to connect signal commands (Pin D and E differential inputs). Securely ground (GND) the shield at a single termination point to shield the LVDT signal loop from workshop electromagnetic interference.

• Never Tamper with the LVDT Sensor Assembly While Under System Pressure: The rear linear position feedback sensor (LVDT) is digitally nulled and calibrated to match its specific OBE circuit board prior to factory shipping. Field technicians must never loosen the rear transducer protection cap or unbolt the valve body while the main system retains its 31.5 MPa hydraulic charge; sudden fluid decompression can damage core feedback elements and pose a severe safety hazard.