Product Overview

DBETX-1X/180G24-8NZ4M

The DBETX-1X/180G24-8NZ4M is a Bosch Rexroth direct-operated proportional pressure relief valve designed for continuous hydraulic pressure limitation through an electrical command signal.

Rexroth’s original RE 29161 documentation defines the DBETX as a direct-operated proportional pressure relief valve using a poppet-type pressure-control element and proportional solenoid actuation. The valve operates with external electronic amplification.

The exact verified model is:

DBETX-1X/180G24-8NZ4M

with:

Bosch Rexroth Material Number: 0811402017.

The model code identifies:

• DBETX: Direct-operated proportional pressure relief valve
• 1X: Component Series 1X
• 180: Maximum set-pressure stage, 180 bar
• G24: 24 VDC electronics supply
• 8: Maximum solenoid current 0.8 A
• N: Manual auxiliary override
• Z4: DIN 43650-AM2 electrical connector
• M: NBR seals for mineral oil HL/HLP.

DBEM10-5X/200XYM

The original title also contains DBEM10-30B/200XYM.

Bosch Rexroth’s RE 29160 documentation defines the DBEM as a pilot-operated proportional pressure relief valve with a maximum pressure relief function. The DBEM adds a spring-loaded pilot pressure-limitation stage to the proportional pressure-control circuit.

The standard Rexroth 5X configuration that can be verified from the original ordering-code structure is:

DBEM 10-5X/200XYM

with:

• Size 10
• Component Series 5X
• 200 bar pressure stage
• External unloading port X
• External pilot drain Y
• NBR sealing.

The additional “30B” appearing in the user-supplied model was not sufficiently verified as a standard Rexroth RE 29160 ordering-code field, so it is intentionally not assigned an engineering meaning here.

Technical Specifications

DBETX-1X/180G24-8NZ4M

• Manufacturer: Bosch Rexroth
• Full Model: DBETX-1X/180G24-8NZ4M
• Material Number: 0811402017
• Product Type: Direct-operated proportional pressure relief valve
• Construction: Poppet valve
• Actuation: Proportional solenoid
• Control: External control electronics
• Nominal Size: NG6
• Mounting: Subplate mounting
• Mounting Pattern: ISO 4401-03-02-0-94
• Component Series: 1X
• Maximum Set Pressure: 180 bar at Q = 1 L/min
• Minimum Pressure: 4 bar at Q = 1 L/min
• Maximum Mechanical Pressure Protection: <186 bar
• Maximum P-Port Working Pressure: 315 bar standard; 350 bar available on request
• Maximum T-Port Pressure: 250 bar
• Pressure-Characteristic Flow Condition: approximately 0.7–1 L/min
• Installation Position: Any
• Ambient Temperature: -20°C to +50°C
• Hydraulic Fluid Temperature: -20°C to +80°C
• Recommended Viscosity: 20–100 mm²/s
• Maximum Permissible Viscosity: 10–800 mm²/s
• Fluid Cleanliness: ISO 4406(c) Class 18/16/13
• Duty Cycle: 100%
• Maximum Solenoid Current: 0.8 A
• Coil Resistance R20: 22 Ω
• Maximum Power Consumption: 25 VA
• Protection: IP65
• Hysteresis: ≤4%
• Reversal Span: ≤3%
• Typical Spread: ≤10%
• 100% Signal Step Response: ON ≤60 ms; OFF ≤70 ms
• Weight: 1.9 kg
• Seal Material: NBR
• Displacement: Not applicable
• Maximum Rotational Speed: Not applicable.

Electrical Data

• Supply Voltage: 24 VDC
• Maximum Solenoid Current: 0.8 A
• Electrical Connector: DIN 43650 / ISO 4400
• Connection: M16 × 1.5, 2P + PE
• External Amplifier: Required
• Compatible amplifier families: VT-VSPA1, VT-VSPD and VT 11131 configurations are specified in the original documentation.

DBEM 10-5X/200XYM

The following values are taken only from the verified Rexroth DBE(M) 5X Size-10 platform data:

• Manufacturer: Bosch Rexroth
• Series: DBEM
• Verified Standard Configuration: DBEM 10-5X/200XYM
• Product Type: Pilot-operated proportional pressure relief valve
• Maximum Pressure Relief Function: Yes
• Nominal Size: Size 10
• Component Series: 5X
• Pressure Stage: 200 bar
• X: External unloading port
• Y: External pilot-oil drain
• M: NBR seals
• Maximum Operating Pressure, A/B/X: 350 bar
• Maximum Flow: 200 L/min
• Pilot Oil Flow: 0.5–1.8 L/min
• Hydraulic Fluid: Mineral oil HL/HLP according to DIN 51524
• Fluid Temperature: -20°C to +80°C
• Viscosity Range: 15–380 mm²/s
• Cleanliness: ISO 4406(c) Class 20/18/15
• Hysteresis: ±1.5% of maximum set pressure
• Repeatability: <±2% of maximum set pressure
• Linearity: ±3.5% of maximum set pressure
• Command-Value/Pressure Characteristic Tolerance, DBEM: ±2.5% of maximum set pressure
• Step Response: approximately 150 ms for 0→100% and 100→0%, depending on flow and A-line volume
• Weight, Size 10 DBEM: 3.4 kg
• Supply Platform: 24 VDC
• Maximum Control Current: 1.6 A
• Coil Resistance at 20°C: 5.4 Ω
• Maximum Hot Resistance: 7.8 Ω
• Duty Cycle: 100%
• Protection: IP65
• Displacement: Not applicable
• Maximum Rotational Speed: Not applicable.

Key Technical Advantages

1. Direct Proportional Pressure Control

The DBETX uses a proportional solenoid to directly control a poppet-type pressure-relief element.

Changes in electrical current produce changes in electromagnetic force and consequently regulate the pressure limit continuously.

2. Poppet-Type Pressure Element

The poppet design provides a compact direct-acting pressure-control architecture and is specifically identified by Rexroth for the DBETX family.

3. 180 Bar Pressure Stage

For DBETX-1X/180G24-8NZ4M, the “180” pressure stage specifies a maximum set pressure of 180 bar at Q = 1 L/min, while the P-port working pressure is rated separately at 315 bar.

4. Additional Mechanical Pressure Protection With DBEM

DBEM adds a spring-loaded pilot pressure-limitation stage.

Rexroth explicitly recommends this version as a redundant pressure-relief function for abnormal operating conditions.

5. High Main Flow Capability

The verified Size-10 DBEM platform has a maximum flow of 200 L/min, while pilot flow is only 0.5–1.8 L/min.

This illustrates the hydraulic amplification inherent in the pilot-operated architecture.

6. External Unloading Capability

The XY configuration adds an external unloading port X together with a separate external pilot drain Y.

This provides additional flexibility for pressure-control and unloading circuits.

7. Standardized ISO Mounting

The DBETX uses ISO 4401-03-02-0-94 mounting for NG6 integration into standard subplates and manifolds.

8. Defined Dynamic Characteristics

The verified DBETX data include:

• Hysteresis ≤4%
• Reversal span ≤3%
• Typical spread ≤10%
• ON response ≤60 ms
• OFF response ≤70 ms.

Application Areas

Typical applications include:

• Industrial hydraulic power units
• Pressure limitation circuits
• Hydraulic clamping systems
• Machine tools
• Hydraulic test equipment
• Industrial automation
• Electro-hydraulic pressure-control systems
• Pressure-regulated auxiliary circuits
• Forming and processing machinery
• High-flow industrial hydraulic systems
• Hydraulic systems requiring redundant maximum-pressure protection

Rexroth defines DBE/DBEM primarily for limiting hydraulic system pressure and continuously adjusting that pressure according to the electrical command value.

Expert Maintenance Tips

1. Use the Correct External Amplifier

DBETX is an externally amplified proportional valve.

The valve, amplifier and command signal should therefore be treated as one matched control system.

2. Match the 0.8 A Coil Version

The “-8” code identifies a maximum solenoid current of 0.8 A.

Do not substitute the 2.5 A version without checking the amplifier and electrical circuit.

3. Understand the Q = 1 L/min Test Condition

The DBETX pressure-stage rating is defined at approximately 1 L/min.

The 180 bar designation should therefore not be interpreted as a universal maximum-flow or system-flow rating.

4. Maintain ISO 4406 Class 18/16/13

The official DBETX cleanliness requirement is ISO 4406(c) Class 18/16/13.

Poor contamination control can affect poppet seating, pressure stability and proportional response.

5. Keep the DBEM Y Drain at Low Back Pressure

For DBEM XY configurations, the Y port is an external pilot drain that must return separately and at zero pressure to tank.

6. Verify the DBEM X Unloading Circuit

The X port is an external unloading port in the XY configuration.

Verify the complete hydraulic circuit before replacing or modifying the valve.

7. Check the DBEM Maximum-Pressure Limitation

When abnormal pressure occurs, inspect the proportional solenoid, pilot stage, spring-loaded limitation stage and X/Y circuits rather than simply increasing or reducing the amplifier output.

8. Perform Complete Functional Testing

For DBETX:

24 VDC → external amplifier → command signal → 0.8 A solenoid → poppet → pressure output

For DBEM:

external amplifier → proportional solenoid → pilot stage → main spool → A/B/X/Y circuit → pressure limitation

The final replacement test should include command range, pressure stability, dynamic response, leakage and maximum-pressure protection.

Our OEM replacement program can add 100% simulated operating-condition testing to validate hydraulic function, electrical compatibility and in-situ interchangeability before shipment.