4WRPE6E32SJ-2X/G24K0/A1M Rexroth High-Response Valve 315Bar

Product Overview:

The 4WRPE 6 E32SJ-2X/G24K0/A1M and 4WRP10E32S-1X/G24Z4/M belong to the Bosch Rexroth 4WRPE / 4WRP series of high-response proportional directional valves. These are direct-operated spool valves featuring electrical position feedback (LVDT). The 4WRPE version includes on-board electronics (OBE), while the 4WRP version requires an external amplifier. The spool uses positive overlap (symbol E for symmetrical overlap) with progressive flow characteristic (S). Fully compliant with ISO 4401 mounting patterns, these valves offer true interchangeability as drop-in replacements for original Rexroth units without manifold or piping modifications. Every valve undergoes precision machining and 100% simulated duty-cycle testing to deliver high response sensitivity, low hysteresis, and stable flow control for precise position and velocity closed-loop systems.

Technical Specifications 

• Model: 4WRPE 6 E32SJ-2X/G24K0/A1M (with OBE); 4WRP10E32S-1X/G24Z4/M (external amplifier)
• Nominal Size: NG6 (ISO 4401-03) / NG10 (ISO 4401-05)
• Spool Symbol: E (symmetrical positive overlap)
• Flow Characteristic: S (progressive)
• Rated Flow (Δp = 5 bar per control edge): 32 L/min (NG6); 32 L/min (NG10, series options up to 50/80 L/min)
• Maximum Operating Pressure: Ports P, A, B 315 bar (up to 350 bar in newer series); Port T 200–250 bar
• Actuation: Proportional solenoid with position closed-loop control (OBE or external amplifier)
• Supply Voltage: 24 V DC (G24)
• Command Signal (A1 interface): 0…±10 V (differential)
• Response Time (0–100% signal): Approx. 12–25 ms (size-dependent)
• Hysteresis: ≤0.2–0.3%
• Weight: Approx. 3.9 kg (NG6); 6–8 kg (NG10)
• Seals: NBR (M code, suitable for mineral oil)
• Filtration: ISO 4406 18/16/13
• Ambient Temperature: –20°C to +50/60°C

Key Technical Advantages:

1. High response with precise position feedback – Integrated LVDT and closed-loop control deliver hysteresis below 0.2–0.3% and excellent response sensitivity for accurate flow and direction control.
2. Positive-overlap spool with progressive flow characteristic – Positive overlap ensures stable center position; the progressive (S) curve provides fine control at low signals and rapid response at high signals, ideal for position/velocity loops.
3. True interchangeability and standard mounting – Fully compliant with ISO 4401 NG6/NG10 interfaces, enabling direct drop-in replacement of original Rexroth valves and minimizing system modification costs.
4. Robust, energy-efficient design – Direct operation eliminates pilot oil demand, offering high flow at low pressure drop; precision-matched housing and spool, validated by 100% duty-cycle testing, ensure long service life.

Application Areas:

Ideal for injection molding machines, die-casting equipment, hydraulic presses, machine-tool feed systems, test stands, steel and metallurgical plants, aerospace test benches, and any industrial hydraulic system requiring high-precision position or velocity control.

Expert Maintenance Tips:

Ensure manifold surface quality meets specifications (Ra ≤ 0.8 µm) and tighten mounting bolts to the specified torque; verify correct electrical grounding and use matching connectors; maintain fluid cleanliness at ISO 4406 18/16/13 or better to prevent spool sticking; periodically check position transducer signals and amplifier parameters; confirm command-signal zero-point calibration before first power-up; during extended downtime, energize the valve periodically to keep the spool lubricated.