Rexroth 4WRPEH6 Series Proportional Directional Control Valves

Model: 4WRPEH6 C3 B04L-2X/G24K0/F1M

Brand Bosch Rexroth

Series 4WRPEH6 Series Proportional Directional

Model 4WRPEH6 C3 B04L-2X/G24K0/F1M

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Technical Dossier

Product Details And Specifications

Bosch Rexroth 4WRPEH6 Series: Comprehensive Module Range and Technical Overview

The Bosch Rexroth 4WRPEH6 is a 4/3-way proportional directional control valve in size NG6 (CETOP 3), designed for closed-loop electrohydraulic position, velocity, and force control in demanding industrial environments. This series holds a significant installed base across global heavy industry sectors including petrochemical refining, nuclear auxiliary systems, offshore hydraulic power units, steel mill roll gap control, and continuous casting machines. Its integrated electronics (OBE — on-board electronics) eliminate the need for external amplifier cards, reducing panel space and wiring complexity. The 4WRPEH6 series is manufactured in Germany and complies with ISO 4401-03-02-0-05 mounting interface standards, making it a direct drop-in replacement in most NG6 valve manifold systems.

The Evolution of 4WRPEH6 Architecture

The 4WRPEH6 series traces its lineage to Rexroth's earlier analog proportional valve platforms of the 1980s, which required external amplifier cards (VT-VSPA series) mounted in separate control cabinets. The introduction of the -2X generation marked a pivotal shift: integrated digital electronics (LUDV-compatible, with enable input, ramp generators, and dither adjustment) were embedded directly into the valve body. The -3X generation (where applicable) further refined the spool geometry for improved hysteresis performance (<0.1% of rated signal) and extended the operating temperature range to -20°C to +70°C ambient.

Key compatibility considerations across generations: the hydraulic port pattern (ISO 4401-03) is consistent across all generations, but the electrical connector changed from DIN 43650 (older) to AMP Junior Timer / M12 in later -2X variants. Control signal interface evolved from ±10 V analog to optional fieldbus-ready variants (PROFIBUS, CANopen) in the 4WRPEH…-3X and 4WRPE…E sub-series. Engineers maintaining legacy installations must verify the amplifier card compatibility (VT-VSPA1, VT-VSPA2-1X) when replacing older non-OBE valves with current OBE units.

4WRPEH6 Full Catalog & Functionalities (SKU List)

The following SKUs represent the documented production range of the 4WRPEH6 series. Each entry reflects a distinct configuration of spool type, flow rating, control signal, and supply voltage. All are NG6 / CETOP 3 frame size.

4WRPEH6 C3 B04L-2X/G24K0/F1M: 4/3-way, spool C3, 4 L/min rated flow, OBE, 24 VDC, M12 connector, current input.
4WRPEH6 C4 B04L-2X/G24K0/F1M: Spool C4 (open center), 4 L/min, OBE, 24 VDC, M12 connector.
4WRPEH6 C3 B08L-2X/G24K0/F1M: Spool C3, 8 L/min rated flow, OBE, 24 VDC, M12 connector.
4WRPEH6 C3 B08L-2X/G24K0/A1M: Spool C3, 8 L/min, OBE, 24 VDC, voltage input (±10 V).
4WRPEH6 C4 B08L-2X/G24K0/F1M: Spool C4, 8 L/min, OBE, 24 VDC, current input.
4WRPEH6 C3 B16L-2X/G24K0/F1M: Spool C3, 16 L/min rated flow, OBE, 24 VDC, M12 connector.
4WRPEH6 C4 B16L-2X/G24K0/F1M: Spool C4, 16 L/min, OBE, 24 VDC, current input.
4WRPEH6 C3 B16L-2X/G24K0/A1M: Spool C3, 16 L/min, OBE, 24 VDC, voltage input (±10 V).
4WRPEH6 C3 B04L-3X/G24K0/F1M: Third-generation (-3X) spool C3, 4 L/min, enhanced hysteresis spec, OBE, 24 VDC.
4WRPEH6 C3 B08L-3X/G24K0/F1M: Third-generation, spool C3, 8 L/min, OBE, 24 VDC.
4WRPEH6 C3 B16L-3X/G24K0/F1M: Third-generation, spool C3, 16 L/min, OBE, 24 VDC.
4WRPEH6 C4 B16L-3X/G24K0/F1M: Third-generation, spool C4, 16 L/min, OBE, 24 VDC.
4WRPEH6 C3 B04L-2X/G24K0/F1M-K0: Spool C3, 4 L/min, OBE, 24 VDC, with position feedback (LVDT) output signal.
4WRPEH6 C3 B08L-2X/G24K0/F1M-K0: Spool C3, 8 L/min, OBE, 24 VDC, with LVDT position feedback output.
4WRPEH6 C3 B16L-2X/G24K0/F1M-K0: Spool C3, 16 L/min, OBE, 24 VDC, with LVDT position feedback output.
4WRPEH6 C3 B04L-2X/G12K0/F1M: Spool C3, 4 L/min, OBE, 12 VDC supply variant.
4WRPEH6 C4 B04L-2X/G12K0/F1M: Spool C4, 4 L/min, OBE, 12 VDC supply variant.

Sourcing Hard-to-Find & Obsolete 4WRPEH6 Parts

The 4WRPEH6 series entered its mature/maintenance phase as Rexroth's product roadmap shifted toward the 4WRPEH…-3X and the newer 4WRPE(H)…E (EtherNet/IP, PROFINET) sub-families. Many -2X generation units are no longer available through standard distribution channels, and lead times from the OEM for low-volume orders can exceed 16–24 weeks.

DriveKNMS maintains a dedicated inventory of tested surplus and refurbished 4WRPEH6 units sourced from decommissioned plant equipment, providing lifecycle extension support for installations where a full hydraulic system upgrade is not economically viable. Our stock covers the full spool-type and flow-rating matrix (B04L, B08L, B16L) across both -2X and -3X generations. For end-users operating in regulated industries (nuclear auxiliary, offshore), we provide full traceability documentation including test records and origin certificates upon request.

Quality Control for the 4WRPEH6 Range

Each 4WRPEH6 unit processed by DriveKNMS undergoes a structured validation protocol specific to OBE proportional valves:

Electrical continuity and insulation test: Solenoid coil resistance verification (nominal 26 Ω ± 5% at 20°C for 24 VDC variants); insulation resistance >100 MΩ at 500 VDC between coil and body.
OBE electronics functional test: Enable signal activation, ramp generator response, dither frequency and amplitude verification against Rexroth RE 29 054 datasheet parameters.
Spool stroke and null position calibration: Verified using a hydraulic test bench at rated system pressure (up to 315 bar); null leakage measured and compared against OEM specification (<1.5 cm³/min at 100 bar Δp for C3 spool).
LVDT feedback signal verification (for -K0 variants): Output linearity across full stroke (±100% command signal) confirmed within ±0.5% of full scale.
Connector and sealing inspection: M12 connector pin integrity, O-ring condition (NBR standard; FKM available for high-temperature applications), and port thread inspection per ISO 4401-03 gauge.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.