4WRPE10E80SJ-2X Rexroth Proportional Valve NG10 350 bar

Product Overview

The 4WRPE10E80SJ-2X/G24K0/A1M-785 (Material No. 0811404775) 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. The valve 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 4WRPE10E80SJ-2X/G24K0/A1M-785 are defined by three factors: the direct-operated architecture requires no external pilot oil, delivering faster response and greater contamination tolerance; the LVDT position sensor provides full closed-loop spool position control with extremely low hysteresis and high repeatability; and the 80 L/min rated flow combined with 315 bar maximum operating pressure covers applications ranging from precision injection molding to heavy-duty die casting.

The valve mounts via subplate according to ISO 4401-05-04-0-94 (Cetop 5 / NG10). Model code breakdown: “E” denotes positive overlap spool, “80SJ” specifies 80 L/min rated flow with linear flow characteristic (S), “A1M” represents ±10 V analog control signal, “G24K0” indicates DC 24 V supply, and “-785” is the variant identifier.

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 and verified supplier technical pages:

• Complete Model: 4WRPE10E80SJ-2X/G24K0/A1M-785

• Material Number (MNR): 0811404775

• 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: E-type spool (positive overlap, industrial standard spool)

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

• Mounting: Subplate mounting

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

• Max Operating Pressure (Port T): 200 bar

• Rated Flow: 80 L/min (at Δp = 5 bar per control edge)

• Maximum Flow: 50 – 80 L/min (series range)

• Flow Characteristic: S = progressive flow characteristic

• Drive Type: Direct-operated, dual proportional solenoids, 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’)

• Power Consumption: < 60 VA

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

• Input Impedance: 100 kΩ

• Hysteresis: ≤ 0.3%

• Response Time (100% Step): 40 ms

• Response Time (110% Step): 10 ms

• Internal Leakage (per metering edge): ≤ 80 cm³/min

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

• External Fuse: 2.5 A

• Hydraulic Fluid: Mineral oil (HL, HLP per DIN 51524)

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

• Protection Class: IP65

• Temperature Range: -20 °C to +80 °C (media); -20 °C to +60 °C (ambient)

• Weight: 8.3 kg

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

• Mounting Position: Any

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; E = positive overlap spool; 80SJ = rated flow 80 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; -785 = variant identifier. This valve is a variant of the 4WRPE10E80SJ-2X/G24K0/A1M (Material No. 0811404771) within the same series.

Key Technical Advantages

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

The 4WRPE10E80SJ-2X employs a direct-operated design in which the spool is driven directly by dual proportional solenoids, eliminating the need for external pilot oil supply. Compared with pilot-operated proportional valves, this architecture removes the additional leakage and pressure losses associated with pilot oil circuits, delivers faster response, and significantly reduces sensitivity to fluid contamination. 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 0.3% 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 of just 0.3% and repeatability at industrial servo-grade levels. In applications such as injection molding hold-pressure phases and precision press-fitting, where control precision directly determines product consistency, this characteristic is decisive. The progressive flow characteristic enables fine flow resolution at low command levels before opening wider for maximum delivery, improving positional stability in servo circuits.

3. Fast Dynamic Response with 40 ms Full-Stroke Response Time

The valve’s step response time does not exceed 40 ms (100% step), and only 10 ms when driven 10% beyond, satisfying high-frequency dynamic loading, rapid directional switching, and precision velocity control requirements. The direct-operated architecture eliminates pilot-stage response lag, enabling the valve to rapidly track command signal changes. This characteristic is particularly critical for material testing machines, vibration tables, and other equipment requiring high-frequency dynamic response.

4. High Pressure Rating with Precision-Lapped Spool Assembly

Maximum operating pressure at ports P/A/B is 315 bar with port T rated at 200 bar, allowing direct integration into high-pressure hydraulic circuits for medium-duty industrial applications. The spool and sleeve are manufactured from high-strength alloy steel through multiple precision lapping operations, with clearance tolerances held to stringent specifications. Internal leakage is limited to 80 cm³/min per metering edge, effectively conserving energy and maintaining position accuracy. The E-type positive overlap spool design provides reliable sealing at center position, suitable for applications requiring precise stopping and pressure holding.

5. Comprehensive Fail-Safe Protection and Environmental Design

The valve features comprehensive fail-safe protection: when supply voltage drops below 15 V (restart at ≥ 17.5 V), 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.

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 18/15 or better

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

• Tighten mounting bolts in diagonal sequence to specified torque

• Any mounting position is permissible, but ensure electrical connector engagement is secure

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

• Maintain media temperature within -20 °C to +80 °C and ambient temperature within -20 °C to +60 °C

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

• External fuse rating is 2.5 A; periodically check fuse continuity

• Monitor internal leakage per metering edge; significant increase beyond 80 cm³/min indicates spool/sleeve wear

• 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 315 bar allowable range; check spool metering edges for partial blockage by contaminant particles

• Electronics alarm: Verify supply voltage is within normal range; check external fuse (2.5 A) for continuity

• Abnormal noise: Check that system return pressure does not exceed the 200 bar maximum; confirm no back-pressure blockage in the return line