4WRPE6W32SJ-2X Rexroth Proportional Valve NG6 315 bar

Product Overview

The 4WRPE6W32SJ-2X/G24K0/A1M (Material No. 0811404143) is a direct-operated high-response proportional directional valve from Bosch Rexroth’s 4WRPE6 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 valve mounts via subplate according to ISO 4401-03-02-0-94 at nominal size NG6 (Cetop 3), with maximum operating pressure of 315 bar at ports P/A/B and 200 bar at port T. Rated flow is 32 L/min at Δp = 5 bar per control edge. Model code breakdown: “W” denotes the W-type spool enabling bidirectional throttling around the neutral point, “32SJ” specifies 32 L/min rated flow with progressive flow characteristic (S), “G24K0” represents DC 24 V supply, and “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 technical documentation and verified supplier technical pages:

• Complete Model: 4WRPE6W32SJ-2X/G24K0/A1M

• Material Number (MNR): 0811404143

• Brand: Bosch Rexroth

• Product Series: 4WRPE6 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: W-type spool (bidirectional throttling around neutral)

• Nominal Size: NG6 (ISO 4401-03-02-0-94 / Cetop 3)

• Mounting: Subplate mounting

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

• Max Operating Pressure (Port T): 200 bar

• Rated Flow: 32 L/min (at Δp = 5 bar per control edge)

• Maximum Flow: 101 L/min

• 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’)

• Input Impedance: 100 kΩ

• Hysteresis: ≤ 0.3%

• Inversion Range: ≤ 0.2%

• Step Response (100%): 20 ms

• Internal Leakage (per metering edge): ≤ 80 cm³/min (at 100 bar)

• Electrical Connector: 6P+PE (DIN 43563-AM6 / EN 175201-804)

• Hydraulic Fluid: HL, HLP, HLPD, HVLP, HVLPD, HFC

• Seal Material: NBR nitrile rubber

• Protection Class: IP65

• Cleanliness Requirement: ISO 4406 18/16/13

• Weight: Approx. 3.78 kg

Note: Specifications are based on Bosch Rexroth official technical documentation and verified supplier technical pages. Model code breakdown: 4WRPE = 4/3 direct-operated proportional directional valve with integrated electronics (OBE); 6 = size NG6; W = W-type spool; 32SJ = rated flow 32 L/min with S = progressive flow characteristic; 2X = component series; G24K0 = DC 24 V supply; A1 = analog ±10 V; M = NBR seals. The related model 4WRPE6W32SJ-2X/G24K0/F1M (Material No. 0811404147) uses a 4-20 mA current input interface.

Key Technical Advantages

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

The 4WRPE6W32SJ-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. 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 (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.

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 no more than 0.3% and inversion range limited to 0.2%, with repeatability at industrial servo-grade levels. In applications such as injection molding hold-pressure phases and precision press-fitting, this characteristic is decisive.

3. 20 ms Fast Dynamic Response with Progressive Flow Characteristic

The valve’s step response time (100% stroke) is just 20 ms, satisfying high-frequency dynamic loading, rapid directional switching, and precision velocity control requirements. The W-type spool enables bidirectional throttling around the neutral point. The progressive flow characteristic allows fine flow resolution at low command levels before opening wider for maximum delivery, improving positional stability in servo circuits.

4. High Pressure Rating with Compact Structure

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 without additional pressure-reducing stages, suitable for medium-capacity high-pressure industrial applications. With a total weight of only 3.78 kg, the compact NG6 size enables direct mounting on compact manifolds without additional support brackets, easing handling during maintenance.

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), the electronics de-energize the control solenoids, and the spool is held in the mechanical center position by compression springs. 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

• 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 4401-03-02-0-94 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 mounting bolts 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: HL, HLP, HLPD, HVLP, HVLPD 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 internal leakage per metering edge; significant increase beyond 80 cm³/min (at 100 bar) 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 control signal line integrity

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