4WRPEH 6 C3 B24L Rexroth Proportional Valve 315 Bar

Product Overview

The Bosch Rexroth 4WRPEH 6 C3 B24L-2X/G24K0/A1M is a high-response, direct-operated proportional directional valve with electrical position feedback and integrated on-board electronics (OBE).

It is designed for continuous hydraulic flow and directional control in dynamic industrial applications rather than simple on/off switching. Rexroth’s 4WRPEH architecture uses proportional actuation, electronic spool-position feedback and integrated control electronics.

The source title contains three related configurations:

• 4WRPEH 6 C3 B12L-2X/G24K0/A1M
• 4WRPEH 6 C3 B24L-2X/G24K0/A1M
• 4WRPEH 6 C3 B12L-20/G24K0/A1M-816

The standard 2X configurations can be identified as:

• 0811404601 → 4WRPEH 6 C3 B12L-2X/G24K0/A1M
• 0811404602 → 4WRPEH 6 C3 B24L-2X/G24K0/A1M.

The B24L version is specified with:

• nominal size 6
• 24 L/min nominal flow
• 315 bar maximum operating pressure
• 24 V DC supply
• ±10 V command input
• NBR seals
• integrated position feedback.

The B12L version is the corresponding 12 L/min nominal-flow configuration.

A critical ordering-code point is that B12/B24 defines nominal flow, while G24 defines the 24 V DC electronic supply. Therefore, B24 does not mean a 24 V valve by itself.

Technical Specifications

4WRPEH 6 C3 B12L-2X/G24K0/A1M

• Model: 4WRPEH 6 C3 B12L-2X/G24K0/A1M
• Bosch Rexroth Material Number: 0811404601
• Valve Type: Direct-operated proportional directional valve with electrical position feedback and integrated electronics
• Nominal Size: NG6 / Size 6
• Spool Configuration: C3
• Nominal Flow: 12 L/min
• Flow Characteristic: Linear
• Maximum Operating Pressure: 315 bar
• Actuation: Proportional direct actuation with integrated electronic position control
• Position Feedback: Integrated electrical position feedback
• Electrical Supply: 24 V DC
• Command Input: ±10 V
• Electrical Interface: K0
• Seal Material: NBR
• Mounting: Subplate mounting
• Interface Class: NG6 / CETOP 03 class
• Displacement: Not applicable
• Maximum Speed: Not applicable
• Peak Pressure: No separate official peak-pressure rating is defined; the applicable maximum operating pressure is 315 bar
• Weight: An approximately 1.99 kg value appears in an inventory listing, but it is not treated here as an official Rexroth single-part weight.

4WRPEH 6 C3 B24L-2X/G24K0/A1M

• Model: 4WRPEH 6 C3 B24L-2X/G24K0/A1M
• Bosch Rexroth Material Number: 0811404602
• Valve Type: Direct-operated proportional directional valve with electrical position feedback and integrated electronics
• Nominal Size: NG6 / Size 6
• Spool Configuration: C3
• Nominal Flow: 24 L/min
• Flow Characteristic: Linear
• Maximum Operating Pressure: 315 bar
• Actuation: Proportional direct actuation with integrated electronic position feedback
• Position Feedback: Integrated position feedback
• Electrical Supply: 24 V DC
• Command Input: ±10 V
• Electrical Interface: K0
• Seal Material: NBR
• Mounting: Subplate mounting
• Interface Class: NG6 / CETOP 03 class
• Displacement: Not applicable
• Maximum Speed: Not applicable
• Peak Pressure: No separate official peak-pressure specification; maximum operating pressure is 315 bar
• Weight: An approximately 1.94 kg value appears in an inventory listing, but this is not treated as an official Rexroth single-part weight.

4WRPEH 6 C3 B12L-20/G24K0/A1M-816

• Model: 4WRPEH 6 C3 B12L-20/G24K0/A1M-816
• Valve Type: High-response proportional directional valve
• Platform: 4WRPEH 6 / C3 / B12L
• Nominal Flow: 12 L/min
• Maximum Operating Pressure: 315 bar, based on the corresponding B12L platform data
• Electrical Supply: 24 V DC
• Command Input: ±10 V
• Seal Material: NBR
• Status: Legacy / historical ordering configuration; historical records indicate the -816 version was discontinued and has replacement information.
• Displacement: Not applicable
• Maximum Speed: Not applicable
• Peak Pressure: No separate official peak-pressure rating
• Weight: Not stated because an authoritative single-part value for this exact -816 configuration could not be verified

Key Technical Advantages

1. High-response proportional directional control

The key advantage of the 4WRPEH is continuous modulation rather than simple electrical switching.

The integrated electronics compare command value with actual spool position and regulate the proportional solenoid accordingly. Rexroth documentation describes this feedback-based OBE architecture for the 4WRPEH platform.

This makes the valve suitable for dynamic actuator speed, position and motion-control applications.

2. Two nominal-flow configurations

The same C3 / NG6 platform is available with different nominal-flow levels:

• B12L: 12 L/min
• B24L: 24 L/min.

This allows engineers to match valve capacity to actuator demand without changing the basic electrical control architecture.

3. 315 bar maximum operating pressure

Both standard configurations are specified for up to 315 bar maximum operating pressure.

The pressure rating is a maximum operating limit and should not be interpreted as unlimited simultaneous operation at maximum pressure and maximum flow.

4. Electrical position feedback

Unlike simple open-loop proportional valves, 4WRPEH uses electrical spool-position feedback.

The feedback system continuously detects actual spool position while the integrated electronics correct the control deviation. This contributes to more consistent dynamic behavior and repeatability.

5. Standard ±10 V analog command

The A1 configuration uses a ±10 V command input, allowing straightforward connection to PLC analog outputs, motion controllers and industrial control systems.

6. Linear flow characteristic

The L suffix represents a linear flow characteristic.

A linearized command-to-flow relationship is beneficial when commissioning motion controllers and tuning actuator-speed response.

7. Standard NG6 / CETOP 03 interface

The NG6 standardized subplate architecture makes these valves suitable for compact industrial manifolds and existing hydraulic power units.

For replacement projects, however, the installation interface alone does not establish functional interchangeability; spool configuration, flow level, electronics and dynamic behavior must also match.

8. Precision spool and sleeve engineering

Long-term performance depends on:

• spool-to-sleeve clearance
• metering-edge geometry
• surface finish
• internal leakage
• feedback consistency

For replacement manufacturing, reproducing the external housing is insufficient. Internal hydraulic geometry and control characteristics must also be validated.

9. Suitable for OEM interchangeability

For:

• 4WRPEH 6 C3 B12L-2X/G24K0/A1M
• 4WRPEH 6 C3 B24L-2X/G24K0/A1M
• 4WRPEH 6 C3 B12L-20/G24K0/A1M-816

replacement engineering should verify:

• mechanical interface
• C3 spool function
• nominal flow
• pressure rating
• 24 V DC supply
• ±10 V command
• K0 interface
• NBR sealing
• dynamic response

Our replacement engineering can target both mechanical and functional Interchangeability, followed by 100% simulated operating-condition testing for flow, pressure, spool movement, command response, temperature and continuous cycling.

Application Areas

B12L — 12 L/min

Typical applications include:

• Precision hydraulic clamping
• Machine-tool actuators
• Compact servo-hydraulic systems
• High-response position control
• Industrial test equipment
• Compact hydraulic power units
• Automated reciprocating actuators

B24L — 24 L/min

Typical applications include:

• Hydraulic presses
• Injection-molding auxiliary hydraulics
• Metal-forming equipment
• High-performance machine tools
• Automated hydraulic actuators
• Precision speed-control circuits
• Hydraulic test benches
• Medium-flow servo-hydraulic systems

Final selection should be based on actuator flow demand, pressure, valve pressure drop and required dynamic response.

Expert Maintenance Tips

1. Confirm B12L versus B24L

This is a nominal-flow difference:

• B12L = 12 L/min
• B24L = 24 L/min.

A replacement valve must preserve the original nominal-flow class to avoid changing actuator speed, pressure drop and controller tuning.

2. Do not confuse B24 with G24

The two codes mean different things:

• B12 / B24 → nominal flow
• G24 → 24 V DC electronic supply.

3. Verify ±10 V command polarity

After installation, verify:

• 0 V command
• +10 V command
• -10 V command
• controller zero
• commanded versus actual motion direction

Incorrect polarity can result in the actuator moving opposite to the intended command.

4. Measure the 24 V DC supply under load

Do not validate the supply only with the cabinet unloaded.

Check:

• supply voltage
• voltage drop
• connector condition
• output stability under operation

This is particularly important on older machinery with aged cabling and connectors.

5. Maintain hydraulic cleanliness

Precision proportional spools are sensitive to contamination.

Contamination may cause:

• spool sticking
• increased hysteresis
• unstable flow
• zero-point drift
• slower dynamic response
• increased internal leakage

The filter condition and hydraulic-fluid cleanliness should therefore be checked during replacement.

6. Treat the -816 code as a legacy configuration

4WRPEH6C3B12L-20/G24K0/A1M-816 should not automatically be treated as identical to the standard 4WRPEH6C3B12L-2X/G24K0/A1M.

Historical records confirm the -816 configuration within the same product family, but procurement should verify the nameplate, material number and original machine configuration before selecting the replacement.

7. Protect the feedback and electronics during installation

Inspect:

• subplate mounting face
• O-rings
• mounting screws
• electrical connector
• feedback electronics
• valve cleanliness

Avoid impact loading on the electronic and feedback components during removal or installation.

8. Perform dynamic commissioning after replacement

Recommended checks include:

• 24 V DC supply
• ±10 V command
• zero-point
• positive/negative command
• spool response
• B12L / B24L nominal-flow verification
• P/A/B/T pressure
• dynamic cycling
• thermal stabilization

For OEM replacement products, 100% simulated operating-condition testing should be completed before shipment rather than relying only on electrical continuity and dimensional inspection.