4WRBAE6W18J-2X Rexroth Proportional Valve 80 L/min 315 Bar

Product Overview

The 4WRBAE6W18J-2X/G24N9K31/A1M (Material No. 0811404153) series direct-operated proportional directional valve is manufactured to original Bosch Rexroth technical standards. Belonging to the 4WRBAE series with size 6 (NG6 / CETOP 3 / ISO 4401-03), this valve is a high-performance electro-hydraulic proportional directional control valve. Featuring a direct-operated subplate mounting design conforming to ISO 4401-03-02-0-94 mounting standards, it is equipped with integrated on-board electronics (OBE) without electrical position feedback. The proportional solenoid directly drives the spool for continuous, precise proportional control of both direction and flow magnitude.

This model features spool type W18J with a nominal flow rate of 18 L/min (at Δp = 10 bar per metering notch) and maximum operating pressure of 315 bar (ports P/A/B) and 250 bar on port T. The integrated electronics (OBE) compare the command value with the spool position, adjusting the solenoid current in response to any control deviation. Supply voltage is 24 VDC (G24), command signal is ±10 V (interface A1), electrical connector is K31 type (per DIN EN 175301-803), and seal material is NBR.

This product is dimensionally and functionally identical to the original Rexroth 4WRBAE6 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. This product is interchangeable with Rexroth original part number 0811404153.

Technical Specifications 

General Specifications

• Model: 4WRBAE6W18J-2X/G24N9K31/A1M

• Material No.: 0811404153

• Product Series: 4WRBAE (Size 6 / NG6 / CETOP 3 / ISO 4401-03)

• Component Series: 2X

• Spool Symbol: W18J (4-way, 2-position, spring return)

• Design: Direct-operated, subplate mounting proportional directional valve with integrated on-board electronics (OBE), without electrical position feedback

• Mounting Pattern: ISO 4401-03-02-0-94 (CETOP 03 / NG6)

• Installation Position: Any

Hydraulic Parameters

• Nominal Flow: 18 L/min (at Δp = 10 bar per metering notch, W18J spool corresponds to nominal flow 18 L/min)

• 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

• Fluid Temperature Range: -20°C to +80°C

• Filtration: ISO 4406 20/18/15 or better

• Seal Material: NBR (M type)

Electrical Parameters

• Supply Voltage: 24 VDC (G24)

• Command Signal: ±10 V voltage input (interface A1)

• Solenoid Type: Proportional solenoid, single-sided actuation

• Integrated Electronics: OBE (On-Board Electronics)

• Electrical Connector: K31 type (per DIN EN 175301-803)

• Protection Class: IP65 (with standard connector)

• Maximum Solenoid Current: 2.5 A

• Response Time: Standard response

Materials & Construction

• Valve Body: High-strength cast iron

• Control Spool: Carburized steel, precision ground

• Seals: NBR (standard)

• Surface Treatment: Phosphating / anti-corrosion coating

Weight

• Weight: approx. 3.9 kg

Key Technical Advantages

1. Integrated OBE Electronics for Simplified System Architecture
The 4WRBAE6W18J-2X/G24N9K31/A1M integrates the proportional amplifier directly into the valve body (On-Board Electronics), eliminating the need for an external amplifier. Users can directly drive the spool via a ±10 V signal. The integrated design reduces external wiring and cabinet space requirements while minimizing electromagnetic interference on signal transmission, enhancing system reliability.

2. Direct-Operated Design for Fast Response
The valve features a direct-operated design where the proportional solenoid directly drives the spool without pilot-stage delay, achieving fast response and high dynamic performance. The spool is centered by return springs, automatically returning to the center position upon de-energization, ensuring a safe system state. This structure overcomes the disadvantages of conventional proportional valves with high solenoid force requirements and leakage-prone designs, significantly improving switching reliability and service life.

3. Precision Spool Machining with Positive Overlap Design
The control spool is precision-ground from carburized steel with micron-level clearance control. The valve features positive overlap design, with overlap between ports in the center position to effectively reduce internal leakage. The nominal flow of 18 L/min (at Δp = 10 bar per metering notch) maintains a linear relationship with the command signal for precise speed control.

4. High Power-to-Weight Ratio with Compact System Design
The 4WRBAE6 series features a compact design, with the single solenoid model weighing only approximately 3.9 kg. The high power-to-weight ratio, combined with Rexroth sandwich valves and multi-port subplates, achieves compact and cost-effective system designs. A manual override (N9 type, covered) is available for commissioning and maintenance. The solenoid coil can be rotated by 90° to accommodate different electrical wiring layouts.

5. 100% Simulated Working Condition Testing and Drop-in Interchangeability
Every 4WRBAE6W18J-2X/G24N9K31/A1M 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 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. This product is interchangeable with Rexroth original part number 0811404153 and is compatible with 4WRAE6W15-3X/MN9/24A1 as a functional replacement.

Application Areas

• Injection Molding Machines: Proportional control of injection speed and holding pressure, precise control of mold closing and injection actions

• Hydraulic Presses: Proportional speed and direction regulation for small-to-medium flow closed-loop control systems

• Die Casting Machines: Shot speed and intensification pressure precise regulation

• Material Testing Machines: Force-displacement closed-loop control for loading systems

• Precision Machine Tools: Hydraulic clamping systems, feed control

• Metallurgical Equipment: Precision control for continuous casting machines and rolling mill auxiliary hydraulic systems

• Industrial Automation: Precision motion control for electro-hydraulic control systems

• Wind Power Generation: Pitch control system hydraulic directional control

Expert Maintenance Tips

Installation Guidelines

1. The 4WRBAE6W18J-2X/G24N9K31/A1M 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 4401-03-02-0-94 for installation on NG6 mounting surfaces.

2. 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.

3. Electrical connections must use a K31 connector conforming to DIN EN 175301-803 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.

4. P-Port Orifice Note: This model features a 1.0mm orifice in the P-port, eliminating the need for additional throttle inserts during installation.

Routine Maintenance Procedures

1. Fluid Cleanliness Management: Maintain system fluid cleanliness at ISO 4406 20/18/15 or better. Check fluid particulate contamination every 500 operating hours and replace filter elements and hydraulic fluid when contamination exceeds limits.

2. 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.

3. Coil Resistance Verification: Measure solenoid coil resistance every 1,000 operating hours. Deviation from factory value should not exceed ± 10%. Maximum solenoid current is 2.5 A; monitor for abnormal temperature rise.

4. Internal Leakage Monitoring: Due to the design principle, 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.

5. Fail-Safe Position Verification: Periodically test that the spool reliably returns to the center 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.