Product Overview
The 4WRPEH10C3B50L-2X/G24K0/B5M series high-response proportional directional valve is manufactured to original Bosch Rexroth technical standards. Belonging to the 4WRPEH series with size 10 (NG10 / ISO 4401-05 / CETOP 5), this valve is a direct-operated electro-hydraulic servo proportional control component. Featuring a direct-operated design with electrical position feedback and integrated on-board electronics (OBE), the valve conforms to ISO 4401-05-04-0-94 mounting standards and is equipped with a servo-quality control spool and sleeve. The proportional solenoid directly drives the spool, achieving continuous, precise high-response control of hydraulic actuator direction.
The rated flow is 50 L/min (at Δp = 70 bar) with a maximum operating pressure of 315 bar (ports P/A/B) and 250 bar on port T. It features spool symbol C3 (zero overlap, servo-type) and linear flow characteristic L. The integrated electronics (OBE) compare the command value with the actual position value, activating the stroke solenoid in response to any control deviation. The stroke/control cross-section is proportionally controlled relative to the command value. Factory calibrated. Supply voltage is 24 VDC (G24), command signal is 0-10 V (interface B5), electrical connector is K0 (6P+PE per DIN 43563), and seal material is NBR.
This product is dimensionally and functionally identical to the original Rexroth 4WRPEH10 series valve, offering true drop-in interchangeability for direct replacement of same-specification OEM valves. Every unit undergoes 100% bench testing under simulated working conditions, including rated pressure holding, spool position accuracy, flow linearity, and dynamic response characterization.
Technical Specifications
General Specifications
Model: 4WRPEH10C3B50L-2X/G24K0/B5M
Product Series: 4WRPEH (Size 10 / NG10 / ISO 4401-05 / CETOP 5)
Component Series: 2X (20 to 29 series)
Spool Symbol: C3 (4-way, 3-position, zero overlap, servo-type, spring centered)
Flow Characteristic: Linear, type L
Design: Direct-operated high-response proportional directional valve with electrical position feedback and integrated on-board electronics (OBE)
Mounting Pattern: ISO 4401-05-04-0-94 (CETOP 05 / NG10)
Installation Position: Any
Hydraulic Parameters
Nominal Flow: 50 L/min (at Δp = 70 bar)
Maximum Operating Pressure (Ports P/A/B): 315 bar (4570 psi)
Maximum Tank Port Pressure (Port T): 250 bar (3625 psi)
Hydraulic Fluid: Mineral-based hydraulic oil (HL, HLP per DIN 51524); HFC, HFD, biodegradable oils supported
Viscosity Range: 10 – 800 mm²/s (cSt), recommended 20-100 mm²/s
Fluid Temperature Range: -20°C to +70°C
Ambient Temperature Range: -20°C to +50°C
Filtration: ISO 4406 18/16/13
Seal Material: NBR (M type)
Electrical Parameters
Supply Voltage: 24 VDC (G24, 21-30 VDC range)
Command Signal: 0-10 V voltage input (interface B5)
Electrical Connection: 6P+PE (DIN 43563)
Integrated Electronics: OBE (On-Board Electronics), factory calibrated
Electrical Connector: K0 type
Maximum Power Consumption: 60 VA
Response Time: ≤ 25 ms (0-100% step response)
Hysteresis: ≤ 0.2%
Input Impedance: 100 kΩ
Duty Cycle: Continuous (ED = 100%)
Protection Class: IP65
External Fuse: 2.5 A fast-acting
Vibration Resistance: Max. 25 g, space vibration test in all directions (24 h)
Materials & Construction
Valve Body: High-strength cast iron
Control Spool/Sleeve: Servo-quality control spool and sleeve, zero overlap design
Seals: NBR (M type)
Surface Treatment: Phosphating / anti-corrosion coating
Weight
Key Technical Advantages
1. Servo-Quality Spool and Sleeve with Zero Overlap C3 Spool
The 4WRPEH10C3B50L-2X/G24K0/B5M features a servo-quality control spool and sleeve, with the spool moving in a specially fitted sleeve with micron-level clearance control. The C3 spool is a zero-overlap servo-type design, with no overlap between ports in the center position, enabling high-accuracy closed-loop control of position, velocity, and force. Combined with the integrated inductive position transducer (LVDT) monitoring spool position in real time, hysteresis is ≤ 0.2% and response time is ≤ 25 ms (0-100%), significantly improving repeatability and dynamic response.
2. Integrated OBE Electronics with Closed-Loop Position Control
The valve integrates the proportional amplifier directly into the valve body (OBE), factory calibrated. The integrated electronics compare the command value with the position setpoint value. In the event of a control deviation, the stroke solenoid is activated to adjust the control spool against the spring. The stroke/control cross-section is proportionally controlled relative to the command value. When the command value preset is 0 V, the electronics adjust the control spool to the center position against the spring. Users can directly drive the spool via a 0-10 V signal without an external amplifier, significantly simplifying system architecture.
3. Fail-Safe Position and System Safety Design
When the electronics are switched off, the valve immediately moves to the corresponding safe initial position (intrinsically safe). During this process, the spool moves between P–B/A–T and may cause movement of the controlled component. This must be taken into account during system design. With de-energized solenoids, the spring is in a relaxed state (longest length), and the valve is in the fail-safe position, ensuring a safe system state. Single-side operated, 4/4 fail-safe position in deactivated state.
4. High-Accuracy Flow Control with Linear Characteristic Curve
Precision metering notches are machined on the spool lands, combined with the servo-quality sleeve, delivering linear flow characteristic L. The nominal flow is 50 L/min (at Δp = 70 bar), with flow rate maintaining a linear relationship with the command signal for easy system calibration and precise control. Input impedance is 100 kΩ, accepting standard analog commands from motion controllers without loading delicate output stages. The valve is specifically intended for use in electro-hydraulic controls within production and test systems.
5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WRPEH10C3B50L-2X/G24K0/B5M valve undergoes 100% bench testing prior to shipment, covering 315 bar rated pressure holding, spool position accuracy calibration, flow-signal linearity verification, internal leakage measurement, and solenoid dynamic response characterization. Mounting dimensions, port positions, electrical interfaces, and performance curves are strictly matched to the original Rexroth valve, enabling direct drop-in replacement without modifying piping or control programs.
Application Areas
Injection Molding Machines: High-response proportional control of injection speed and holding pressure, precise control of mold closing and injection actions
Hydraulic Presses: Proportional speed and direction regulation for high-accuracy closed-loop control systems
Material Testing Machines: Force-displacement closed-loop control for loading systems, suitable for electro-hydraulic controls in production and test systems
Die Casting Machines: Shot speed and intensification pressure precise regulation
Metal Forming Equipment: Hydraulic proportional control for stamping and drawing processes
Precision Machine Tools: Hydraulic clamping systems, feed control
Industrial Automation: Precision motion control for electro-hydraulic control systems
Expert Maintenance Tips
Installation Guidelines
The 4WRPEH10C3B50L-2X/G24K0/B5M series can be mounted in any position. Mounting surface flatness must be ≤ 0.05 mm. Tighten mounting bolts diagonally in stages to the specified torque value. The mounting surface conforms to ISO 4401-05-04-0-94 and can be installed on NG10 mounting surfaces or as a top valve in modular valve stacks.
Thoroughly flush all piping circuits before installation. Ensure no welding slag, metal chips, or particulate contaminants remain. Prior to first operation, circulate the system through a 10 μm filter element for a minimum of 30 minutes. This valve has high fluid cleanliness requirements; recommended fluid cleanliness is ISO 4406 18/16/13 or better.
Electrical connections must use a 6P+PE connector conforming to DIN 43563 to maintain IP65 protection. This valve features integrated OBE electronics; control signal cables should be shielded, with the shield grounded at one end to prevent electromagnetic interference causing spool oscillation.
An external 2.5 A fast-acting fuse must be installed to limit fault currents and protect upstream supplies.
Routine Maintenance Procedures
Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 18/16/13 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits. This valve features a servo-quality spool and sleeve with extremely tight clearances, making it sensitive to fluid contamination.
Electrical Zero Point Verification: Periodically check the electrical zero point for drift with the power supply disconnected. If zero point deviation exceeds ± 2%, re-calibrate using dedicated tools via the OBE electronics.
Coil Resistance Verification: Measure solenoid coil resistance every 1,000 operating hours. Deviation from factory value should not exceed ± 10%. Maximum power consumption is 60 VA; monitor for abnormal temperature rise.
Internal Leakage Monitoring: Due to the design principle, high-response proportional valves have inherent internal leakage which may increase over the life cycle. An annual internal leakage test is recommended. If leakage exceeds 150% of the factory standard, seal replacement should be scheduled.
Fail-Safe Position Verification: Periodically test that the spool reliably returns to the fail-safe position upon power loss. If abnormal return is observed, stop operation immediately and inspect springs and spool wear. System design must account for potential movement of the controlled component when the valve is in the fail-safe position.
