4WRAE6W1-15-23/G24K31/F1V | Rexroth Proportional Valve 315bar 26L/min

Product Overview

The 4WRAE6W1-15-23/G24K31/F1V and 4WRAE6W30-23/G24K31/A1V are Bosch Rexroth 4WRAE series direct-operated proportional directional valves, NG6 (CETOP 3) size, with mounting pattern conforming to ISO 4401-03-02-0-05. These 4/3-way proportional directional valves feature Symbol W spool with direct-operated construction, actuated by proportional solenoids with central thread and detachable coil.

The 4WRAE series features digital on-board electronics (OBED). The solenoids are controlled by the integrated electronics, enabling precise control of flow direction and size via electrical signals. Unlike the 4WRA series requiring external amplifiers, the 4WRAE series incorporates onboard electronics for direct command signal input, significantly simplifying system architecture.

Key differences between the two models lie in nominal flow and command signal type:

• 4WRAE6W1-15-23/G24K31/F1V: Nominal flow 15 L/min (@ Δp = 5 bar per control edge), maximum flow 26 L/min, command signal 4–20 mA (F1)

• 4WRAE6W30-23/G24K31/A1V: Nominal flow 26 L/min (@ Δp = 5 bar per control edge), maximum flow 42 L/min, command signal ±10V (A1)

Model Code Breakdown:

• 4WRAE: Direct-operated proportional directional valve with digital on-board electronics (OBED)

• 6: Nominal Size NG6 (6 mm)

• W1 / W30: Spool symbol and nominal flow code (W1 = Symbol W, 15 L/min; W30 = Symbol W, 26 L/min)

• 23: Component Series (2X series, unchanged installation and connection dimensions)

• G24: DC 24V supply

• K31: Control electronics interface configuration

• F1 / A1: Command signal type (F1 = 4–20mA; A1 = ±10V)

As original Bosch Rexroth direct-operated proportional directional valves, these products offer complete interchangeability within the same series and size.

Technical Specifications

4WRAE6W1-15-23/G24K31/F1V:

• Model: 4WRAE6W1-15-23/G24K31/F1V

• Brand: BOSCH REXROTH

• Series: 4WRAE Series, 2X Component Series

• Product Type: Direct-operated proportional directional valve with digital on-board electronics (OBED)

• Spool Configuration: 4/3-way

• Spool Symbol: W1 type

• Nominal Size: NG6 (6 mm)

• Mounting Standard: ISO 4401-03-02-0-05

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 315 bar (4568 psi)

• Nominal Flow (@ Δp = 5 bar): 15 L/min

• Maximum Flow: 26 L/min

• Supply Voltage: 24V DC

• Command Value Input: 4–20 mA (F1)

• Seal Material: FKM (Fluoroelastomer)

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR

• Protection Class: IP65

• Weight: Approx. 1.8–2.2 kg

4WRAE6W30-23/G24K31/A1V:

• Model: 4WRAE6W30-23/G24K31/A1V

• Material Number: R900954078

• Brand: BOSCH REXROTH

• Series: 4WRAE Series, 2X Component Series

• Product Type: Direct-operated proportional directional valve with digital on-board electronics (OBED)

• Spool Configuration: 4/3-way

• Spool Symbol: W type

• Nominal Size: NG6 (6 mm)

• Mounting Standard: ISO 4401-03-02-0-05

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 315 bar (4568 psi)

• Nominal Flow (@ Δp = 5 bar): 26 L/min

• Maximum Flow: 42 L/min

• Switching Positions: 3

• Supply Voltage: 24V DC

• Command Value Input: ±10V (A1)

• Seal Material: FKM (Fluoroelastomer)

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR

• Protection Class: IP65

• Weight: Approx. 1.8–2.2 kg

Key Technical Advantages (4WRAE Series Common)

1. Integrated Digital On-Board Electronics (OBED) — No External Amplifier Required

The 4WRAE series comes standard with digital on-board electronics (OBED), directly accepting 4–20 mA (F1) or ±10V (A1) command signals. Compared to the 4WRA series requiring external amplifiers, the OBED design significantly simplifies the electrical control architecture, reduces external component count, and minimizes wiring complexity.

2. Direct-Operated Design for Fast Response

The direct-operated design employs proportional solenoids to directly actuate the control spool with no pilot stage delay. Solenoids feature central thread and detachable coil construction for easy maintenance.

3. 315 bar High Pressure with Flexible Flow Coverage

Delivers 315 bar (4568 psi) maximum operating pressure in a compact NG6 package. Nominal flow covers 15 L/min (W1) to 26 L/min (W30), with maximum flows reaching 26 L/min and 42 L/min respectively. The W1 type is ideal for precision low-speed control, while the W30 type suits higher flow requirements.

4. Optimized W Spool Characteristics

The W spool symbol features both A and B ports open to T in neutral position, providing excellent neutral unloading characteristics. The W1 spool type features optimized control edge geometry for smooth control without overlap jump (opening point 25% with covered valve). The drain line must be routed separately back to the tank to ensure stable pilot control pressure.

5. FKM Seals for Broad Fluid Compatibility

Both models are equipped with FKM (fluoroelastomer) seals, compatible with HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR, and other hydraulic fluids. FKM seals offer superior heat and chemical resistance.

6. International Standard Compliance for High Installation Compatibility

Mounting conforms to ISO 4401-03-02-0-05 international standards. Fully compatible with globally adopted NG6 interfaces for direct replacement of same-series, same-specification products.

Application Areas

• Injection Molding Machinery — Precise proportional control of injection speed and holding pressure

• Die-Casting Machines — Proportional regulation of injection speed and pressure

• CNC Machine Tools — Proportional control of spindle feed rates and worktable indexing

• Material Testing Machines — Precise proportional control of loading force and displacement

• Metallurgical Equipment — Precise position and speed control for rolling mill hydraulic systems

• Wind Turbine Systems — Hydraulic proportional control for pitch systems

• General Industrial Hydraulic Systems — Various high-precision applications requiring proportional directional and flow control

Expert Maintenance Tips

1. Installation Guidelines

• Mounting surface must conform to ISO 4401-03-02-0-05.

• Thoroughly clean the mounting surface and all ports (P, A, B, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.

• Tighten mounting bolts evenly to the specified torque to ensure proper sealing between the valve body and mounting surface.

• The drain line must be routed separately back to the tank — do not share with other return lines.

2. Hydraulic Fluid Cleanliness

• Recommended fluids: Mineral oils per DIN 51524 (HL, HLP, HLPD, HVLP, HVLPD) or synthetic oils (HETG, HEES, HEPG, HFDU, HFDR).

• Recommended fluid cleanliness: ISO 4406 18/16/13 or better.

• Install a return line filter with minimum 10 μm filtration rating.

3. Electrical Connection Specifications

• Both models use 24V DC supply.

• 4WRAE6W1-15-23/G24K31/F1V command value input: 4–20 mA (F1).

• 4WRAE6W30-23/G24K31/A1V command value input: ±10V (A1).

• Electrical connector per EN standards. Ensure the connector is fully locked to prevent contact issues caused by vibration.

• Shielded cables are recommended for command signal connections to prevent electromagnetic interference.

4. Drain Line Requirements

• The 4WRAE series are direct-operated valves — the drain line must be routed separately back to the tank and must not be blocked or shared with other return lines.

• Under corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed.

5. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• Check electrical connectors for looseness, oxidation, or moisture ingress.

• Periodically inspect OBED electronics status to confirm normal power supply and command signal.

• If response lag or reduced control precision is observed, first check system fluid cleanliness and verify the spool is not sticking.

• Solenoid coils can be replaced without disturbing hydraulic connections.

• Note: Due to the design principle, internal leakage which may increase over the life cycle is inherent to the valves.