4WRPE10EA50SJ-2X Rexroth Proportional Valve NG10 350 bar

Product Overview

The 4WRPE10EA50SJ-2X/G24K0/A1M (Material No. 0811404751) is a direct-operated high-response proportional directional valve from Bosch Rexroth’s 4WRPE10 series, featuring electrical position feedback (LVDT) and integrated on-board electronics (OBE). Built on the 2X component series, it integrates the analog control amplifier directly onto the valve body, eliminating the external amplifier card required in conventional configurations and substantially simplifying control cabinet wiring and system integration.

The core technical characteristics of the 4WRPE10EA50SJ-2X/G24K0/A1M are defined by three factors: the direct-operated architecture requires no external pilot oil, delivering faster response and greater contamination tolerance with a reliable and robust design; the LVDT position sensor provides full closed-loop spool position control with high response sensitivity and minimal hysteresis; and the 50 L/min rated flow combined with 350 bar maximum operating pressure covers applications ranging from precision injection molding to medium-duty die casting. The integrated on-board electronics (OBE) compares the specified command value to the position actual value; in case of control deviations, the relevant solenoid is activated, and the changed magnetic force adjusts the control spool against the corresponding spring, with stroke proportional to the command value. With a command value presetting of 0 V, the electronics adjust the control spool to the center position.

The valve mounts via subplate according to ISO 4401-05-04 at nominal size NG10 (Cetop 5), with maximum operating pressure of 350 bar at ports P/A/B. Model code breakdown: “EA” denotes E-type spool with overlap jump for reduced deadband and quick response; “50SJ” specifies 50 L/min rated flow with progressive flow characteristic (S); “G24K0” represents DC 24 V supply; “A1M” indicates ±10 V analog control signal.

As a drop-in replacement, the valve is fully compatible with the OEM Rexroth specification in mounting interface, electrical connection, and performance characteristics. Every unit undergoes 100% simulation-based testing prior to shipment, covering null stability, flow linearity, step response, and internal leakage.

Technical Specifications

All parameters below are based on Bosch Rexroth official datasheet RE 29122 (Edition 2022-08) and verified supplier technical pages:

• Complete Model: 4WRPE10EA50SJ-2X/G24K0/A1M

• Material Number (MNR): 0811404751

• Brand: Bosch Rexroth

• Product Series: 4WRPE10 series, component series 2X

• Product Type: Direct-operated high-response proportional directional valve with electrical position feedback and integrated electronics (OBE)

• Spool Function: 4/3-way proportional directional valve

• Spool Variant: EA-type spool with overlap jump, reduced deadband

• Nominal Size: NG10 (ISO 4401-05-04-0-94 / Cetop 5)

• Mounting: Subplate mounting

• Max Operating Pressure (Ports P/A/B): 350 bar

• Rated Flow: 50 L/min (at Δp = 5 bar per control edge)

• Flow Characteristic: S = progressive flow characteristic

• Drive Type: Direct-operated, proportional solenoid, no external pilot oil required

• Position Feedback: LVDT displacement sensor, full closed-loop control

• Integrated Electronics: OBE (on-board amplifier), analog signal

• Supply Voltage: DC 24 V (model code ‘G24’)

• Command Signal: ±10 V analog input (model code ‘A1’)

• Hysteresis: < 0.5%

• Step Response: ≤ 10 ms (high-response)

• Electrical Connector: 6P+PE (DIN 43563-AM6)

• Hydraulic Fluid: HLP/HM anti-wear hydraulic oil

• Viscosity Range: 10 – 800 mm²/s

• Seal Material: NBR nitrile rubber (model code ‘M’)

• Cleanliness Requirement: ISO 4406 18/16/13

• Fail-Safe: Spool held in mechanical center position by compression springs on power loss

• Weight: Approx. 5.8 kg

Note: Specifications are based on Bosch Rexroth official datasheet RE 29122 (Edition 2022-08) and verified supplier technical pages. Model code breakdown: 4WRPE = 4/3 direct-operated proportional directional valve with integrated electronics (OBE); 10 = size NG10; EA = E-type spool with overlap jump; 50SJ = rated flow 50 L/min with S = progressive flow characteristic; 2X = component series; G24K0 = DC 24 V supply, K0 connector configuration; A1 = analog ±10 V; M = NBR seals. The related model 4WRPE10EA80SJ-2X/G24K0/A1M (Material No. 0811404752) has a rated flow of 80 L/min. Always verify against the complete model code during selection.

Key Technical Advantages

1. Direct-Operated Architecture with Integrated OBE for Plug-and-Play Operation

The 4WRPE10EA50SJ-2X employs a direct-operated design in which the spool is driven directly by a proportional solenoid, eliminating the need for external pilot oil supply. The valve features a reliable and robust design, no pilot oil demand, high flows with low pressure differential, suitability for position and velocity control, and high response sensitivity with minimal hysteresis. The integrated OBE electronics unit mounts the control amplifier directly on the valve body and is factory-calibrated, enabling operation with only a 24 V DC supply and command signal — no external amplifier card or associated wiring required. The integrated electronics compares the specified command value to the position actual value; in case of control deviations, the relevant solenoid is activated, and the changed magnetic force adjusts the control spool against the corresponding spring, with stroke proportional to the command value. With a command value presetting of 0 V, the electronics adjust the control spool to the center position.

2. LVDT Full Closed-Loop Control with High Response Sensitivity and Minimal Hysteresis

The valve’s core control architecture employs an LVDT displacement sensor to continuously measure actual spool position, feeding the signal back to the on-board OBE electronics for comparison against the command signal and dynamic correction of the solenoid drive current. This full closed-loop mechanism maintains spool positioning accuracy independent of fluid temperature variation, pressure fluctuation, and long-term wear, achieving hysteresis below 0.5% and repeatability at industrial servo-grade levels. In applications such as injection molding hold-pressure phases and precision press-fitting, this characteristic is decisive.

3. Progressive Flow Characteristic with EA-Type Overlap-Jump Spool Design

The valve features a progressive flow characteristic, enabling fine flow resolution at low command levels before opening wider for maximum delivery, improving positional stability in servo circuits. The EA-type spool with overlap jump reduces the deadband during the transition from center to working position, enabling the valve to respond more quickly to command signal changes. The overlap jump activates at approximately 5% command value, which is particularly important for applications requiring fast response and precise stopping.

4. ≤ 10 ms High-Response Dynamics Approaching Servo Valve Performance

The valve’s step response time does not exceed 10 ms, placing it in the high-response proportional valve category with dynamic performance approaching that of conventional servo valves — at significantly lower system cost. The direct-operated architecture eliminates pilot-stage response lag, enabling the valve to rapidly track command signal changes and making it suitable for high-frequency dynamic loading, rapid directional switching, and precision velocity control applications.

5. Comprehensive Fail-Safe Protection and 100% Simulation-Based Testing

The valve features comprehensive fail-safe protection: when supply voltage drops below 15 V (restart at ≥ 17.5 V) or command current falls below 2 mA (including command value line cable break detection), the electronics de-energize the control solenoids, and the spool is held in the mechanical center position by compression springs. The IP65 protection rating prevents dust ingress and water jet exposure from reaching internal electronics. An optional electronics protection membrane (-967) prevents condensate formation in the integrated electronics housing, recommended for use outside industry-standard conditions with high ambient air humidity and significant cyclic temperature changes. An optional damping plate (D) reduces acceleration amplitudes on the on-board electronics at frequencies above 300 Hz. Every unit undergoes 100% simulation-based testing prior to shipment, covering rated flow calibration, hysteresis and linearity measurement, step-response verification, and internal leakage detection.

Application Areas

• Injection Molding Machines: Closed-loop control of injection velocity and hold pressure for consistent part quality

• Die Casting Equipment: High-speed dynamic pressure regulation and real-time switching control

• Hydraulic Presses: Precision position/velocity control, force/position hybrid control

• Material Testing Systems: Flow and pressure closed-loop control for electro-hydraulic servo loading systems, including high-frequency dynamic loading applications

• Vibration Tables & Test Rigs: Precision flow control under high-frequency dynamic response conditions

• Precision Press-Fitting Equipment: Servo-grade closed-loop force/position control

• Machine Tool Hydraulic Systems: Flow and direction control for precision hydraulic feed axes

• General Industrial Hydraulic Systems: Precision directional and flow control for automated production lines

Expert Maintenance Tips

Pre-Installation Checks:

• Verify the manifold mounting surface conforms to ISO 4401-05-04-0-94 standard; surface roughness Rzmax ≤ 4 μm, flatness deviation ≤ 0.01 mm/100 mm

• Flush all piping with clean hydraulic fluid prior to installation; ensure system cleanliness reaches ISO 4406 18/16/13 or better

• Inspect NBR O-rings for damage and confirm compatibility with the hydraulic fluid in use

• Tighten M6 × 40 mounting screws (DIN 912-10.9 strength class) in diagonal sequence to specified torque

Operational Maintenance:

• Use a 5–10 μm precision pressure filter, specified without bypass and equipped with a contamination indicator

• Recommended fluid: HLP/HM anti-wear hydraulic oil; maintain operating viscosity within 10 – 800 mm²/s

• Periodically inspect the integrated OBE electronics status indicators; confirm 24 V DC supply remains stable (above 15 V, restart requires ≥ 17.5 V)

• Monitor null output flow offset; significant increase indicates spool/sleeve wear or LVDT sensor anomaly

• In high-humidity or significant temperature cycling environments, the electronics protection membrane (-967) is recommended to prevent condensate formation

Troubleshooting Guide:

• Spool fails to actuate or responds abnormally: Check 24 V DC supply (electronics automatically de-energize below 15 V), verify ±10 V command signal reaches the A1 input correctly, confirm 6P+PE connector engagement is reliable

• Null-point drift: After ruling out fluid contamination, verify LVDT sensor feedback signal integrity; check whether the spool is stuck at a non-center position due to contamination

• Insufficient flow: Confirm system supply pressure is within the 350 bar allowable range; check spool metering edges for partial blockage by contaminant particles

• Electronics alarm: Verify command current is not below 2 mA (cable break detection trigger); check supply voltage is within normal range

• Abnormal noise: Check that system return pressure is within allowable limits; confirm no back-pressure blockage in the return line