DREBE6X-1X/175MG24K31A1M | Rexroth Proportional Valve 315bar 40L/min

Product Overview

The DREBE6X-1X/175MG24K31A1M (Material Number 0811402080) is a Bosch Rexroth DREBE6X series pilot-operated proportional pressure reducing valve, NG6 (CETOP 3) size, with mounting pattern conforming to ISO 4401-03-02-0-05. This is a pilot-operated proportional 3-way pressure reducing valve featuring electrical position feedback and integrated on-board electronics (OBE) .

The DREBE6X series valves are pilot-operated; the main stage is a 3-way version. The pilot control valve (DBV pilot valve) has a flow-controlled internal pilot oil supply via port P. It is actuated by a position-controlled proportional solenoid with integrated electronics. Dependent on the command value, the pressure in port A (actuator) can be steplessly set and reduced. The valve reduces inlet pressure (P) to controlled secondary pressure (A), with excess flow directed to tank (T). The product features a maximum pressure limitation function that maintains safety even in the event of electronic failure.

Model Code Breakdown (DREBE6X-1X/175MG24K31A1M):

• DREB: Pilot-operated proportional pressure reducing valve

• E: With integrated electronics (OBE)

• 6: Nominal Size NG6 (6 mm)

• X: 6X Component Series (60–69)

• 1X: 1X Component Series (10–19, unchanged installation and connection dimensions)

• 175: Pressure rating — 175 bar

• M: NBR seals

• G24: DC 24V supply (G = DC)

• K31: 6-pin + PE electrical connector

• A1: Command signal type — 0–10V

• M: Without check valve

Technical Specifications 

• Model: DREBE6X-1X/175MG24K31A1M

• Material Number: 0811402080

• Brand: BOSCH REXROTH

• Series: DREBE6X Series, 6X / 1X Component Series

• Product Type: Pilot-operated Proportional Pressure Reducing Valve

• Valve Type: Pilot-operated, 3-way version

• Nominal Size: NG6 (6 mm) 

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

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure P: 315 bar (4568 psi) 

• Maximum Operating Pressure A: 175 bar (2538 psi) 

• Maximum Operating Pressure T: 250 bar (3625 psi) 

• Adjustable Pressure Range: 0–175 bar (electrically proportional)

• Maximum Flow Capacity: 40 L/min

• Pilot Flow Consumption: Approx. 0.6 L/min (internal pilot supply)

• Supply Voltage: 24V DC (G24)

• Control Signal: 0–10V (A1)

• Electrical Connector: 6-pin + PE (K31), per DIN 43563

• Seal Material: NBR (M)

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HFC

• Media Temperature: -20°C to +80°C

• Ambient Temperature: -20°C to +50°C

• Viscosity Range: 10–800 mm²/s (recommended 30–46 mm²/s)

• Hysteresis: ≤ ±1%

• Repeat Accuracy: < ±2%

• Recommended Cleanliness: ISO 4406 20/18/15 or better

• Weight: Approx. 2.4 kg

Key Technical Advantages

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

The DREBE6X-1X/175MG24K31A1M comes standard with integrated on-board electronics (OBE) , directly accepting 0–10V command signals. Compared to traditional proportional valves requiring external amplifiers, the OBE design significantly simplifies the electrical control architecture, reduces external component count, and minimizes wiring complexity.

2. Electrical Position Feedback for Extremely High Control Accuracy

The valve is equipped with electrical position feedback, enabling precise monitoring and control of spool position via internal piston position feedback. Hysteresis is ≤ ±1% with repeat accuracy < ±2%. The feedback signal is continuously compared with the command value, ensuring extremely high control accuracy and excellent dynamic response.

3. Pilot-Operated 3-Way Design with High Functional Integration

This valve features pilot-operated 3-way design, integrating pressure reduction (P→A) and pressure limitation/relief (A→T) in a single valve. When the pressure at port A exceeds the set value, the valve automatically opens the A→T path to limit the pressure. This integrated design eliminates the need for an external relief valve, simplifying manifold layouts.

4. Maximum Pressure Limitation for System Safety

The product features maximum pressure limitation functionality—even in the event of electronic component failure or damage leading to uncontrolled coil current exceeding Imax, the large spring force effectively limits the pressure. This design provides an additional safety layer for the actuator.

5. 315 bar High Pressure and 40 L/min Flow Capacity

Delivers 315 bar maximum inlet pressure and 40 L/min flow capacity in a compact NG6 package. Adjustable pressure range covers 0–175 bar. Port P max pressure is 315 bar, port T max pressure is 250 bar. Suitable for diverse medium-to-high pressure hydraulic systems requiring precise proportional pressure control.

6. Internal Pilot Supply for Simplified Installation

The pilot control valve features a flow-controlled internal pilot oil supply via port P. No external pilot oil lines are required, significantly simplifying system installation and piping layout.

7. 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. The 6-pin + PE electrical connector conforms to DIN 43563.

Application Areas

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

• Die-Casting Machines — Proportional regulation of injection pressure with overpressure protection

• CNC Machine Tools — Precise pressure control for hydraulic clamping and unclamping

• Material Testing Machines — Precise proportional control of loading force

• Metallurgical Equipment — Precise pressure control for rolling mill hydraulic systems

• General Industrial Hydraulic Systems — Various applications requiring precise proportional pressure 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, 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.

2. Hydraulic Fluid Cleanliness

• Compatible fluids: HL, HLP, HLPD, HVLP, HFC, etc.

• Recommended fluid cleanliness: ISO 4406 20/18/15 or better.

• Seal material: NBR (M).

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

3. Electrical Connection Specifications

• DREBE6X-1X/175MG24K31A1M uses 24V DC supply.

• Command value input: 0–10V (A1).

• Electrical connector: 6-pin + PE (K31) per DIN 43563.

• 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 affecting control precision.

4. Maximum Pressure Limitation Verification

• This valve features maximum pressure limitation functionality, maintaining safety even in the event of electronic failure.

• The limitation pressure is set by the large spring force and is factory-preset.

• Do not arbitrarily adjust the maximum pressure limitation setting, as this may compromise overpressure protection.

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 OBE 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 pilot spool is not sticking.

• Solenoid coils can be replaced without disturbing hydraulic connections.