DBETBX-1X/315G24-37Z4M-38 Proportional Pressure Relief Valve Rexroth

Product Overview

The DBETBX series proportional pressure relief valves represent Bosch Rexroth’s mature direct-operated proportional pressure control valve technology. Featuring a poppet seat design, these valves serve as remote control valves (pilot control valves) for stepless system pressure limitation in hydraulic systems. Distinguished from the basic DBET (without position feedback), DBETX (with external amplifier interface), and DBETE/DBETA (with integrated digital electronics), the DBETBX is characterized by a built-in LVDT (AC/AC) position feedback sensor that enables real-time spool position detection and closed-loop precision control.

The DBETBX series is a direct-operated proportional pressure relief valve with position feedback, actuated by a position-controlled proportional solenoid. The valve body features a poppet seat construction, with the solenoid interior connected to port T and filled with hydraulic fluid. Depending on the electrical command value, these valves enable stepless setting of the system pressure to be limited.

This product offers a complete DBETBX series proportional pressure relief valve—including model DBETBX-1X/315G24-37Z4M-38 (material no. 0811402005)—as a direct drop-in replacement alternative for the original Rexroth DBETBX valve. All products are manufactured to strict OEM specifications and undergo 100% real-world condition simulated testing, ensuring seamless integration with existing systems without any modification required.

Core Value Proposition:

• Direct Interchangeability: Full dimensional, interface, and electrical compatibility with original Rexroth DBETBX valves

• 100% Simulated Condition Testing: Complete validation of pressure, flow, and response characteristics under actual operating parameters prior to shipment

• Built-in LVDT Position Feedback: Real-time closed-loop control for precision pressure limitation

• Direct-Operated Poppet Seat Design: Fast response with reliable sealing for stepless pressure regulation

Technical Specifications 

Valve Type

• Direct-operated proportional pressure relief valve with position feedback (remote control valve/pilot control valve), poppet seat design

Product Series

• DBETBX: Direct-operated proportional pressure relief valve with position feedback (LVDT AC/AC)

Size (NG)

• 6

Component Series

• 1X (Series 10 to 19, unchanged installation and connection dimensions)

Maximum Operating Pressure (Port P)

• 315 bar

Maximum Return Pressure (Port T)

• 250 bar

Rated Flow

• 1 L/min

Maximum Flow

• 1.5 L/min

Supply Voltage

• 24 VDC

Coil Current

• 3.7 A

Electrical Connection

• 3-pin (2+PE) connector per EN 175301-803

• DIN 43650-AM2 (Z4) connector

Seal Material

• NBR (Nitrile rubber)

Mounting

• Subplate mounting

Mounting Interface

• ISO 4401-03-02-0-05

Protection Class

• IP65 per DIN EN 60529

Operating Temperature Range (Ambient)

• -20°C to +50°C

Weight

• Approx. 4.1 kg

Hydraulic Fluid Compatibility

• HL, HLP, HLPD, HVLP, HVLPD, HFC

Duty Cycle

• 100%

Model Code Breakdown (DBETBX-1X/315G24-37Z4M-38)

• DBETBX: Direct-operated proportional pressure relief valve with position feedback (LVDT AC/AC)

• 1X: Component series 10-19

• 315: Pressure rating 315 bar

• G24: DC supply 24V

• 37: Coil current rating (3.7A)

• Z4: Electrical connector type (DIN 43650-AM2)

• M: NBR seals

• -38: Special configuration suffix (enhanced EMC/EMI protection)

Series Sub-Models Description

• DBET: Basic direct-operated proportional pressure relief valve, no integrated electronics, requires external amplifier

• DBETX: Direct-operated proportional pressure relief valve with external amplifier interface

• DBETE: Direct-operated proportional pressure relief valve with integrated electronics (OBE)

• DBETR: Direct-operated proportional pressure relief valve with ramp function

• DBETBX: Direct-operated proportional pressure relief valve with position feedback (LVDT)

• DBETBEX: Direct-operated proportional pressure relief valve with position feedback + integrated digital electronics (OBED)

Key Technical Advantages

1. Built-in LVDT Position Feedback — Closed-Loop Precision Pressure Control
The DBETBX incorporates a built-in LVDT (AC/AC) linear displacement feedback sensor that continuously detects actual spool position and feeds back to the external control electronics. The control unit dynamically adjusts drive current based on deviations between target pressure command and feedback value, forming a complete negative feedback closed-loop control system. This design effectively compensates for control deviations caused by oil temperature fluctuations, fluid force variations, and friction resistance, achieving precise linear correspondence between input electrical signals and system limiting pressure—ensuring high accuracy and repeatability in pressure control.

2. Direct-Operated Poppet Seat Design — Fast Response with Reliable Sealing
The DBETBX features a poppet seat construction as a direct-operated remote control valve (pilot control valve). Compared to pilot-operated pressure relief valves, the direct-operated design eliminates response delays from the pilot stage and pressure fluctuations in pilot oil circuits, enabling faster pressure response. The poppet seat structure simultaneously provides excellent sealing performance with extremely low leakage in the closed state, effectively maintaining system pressure stability.

3. High Solenoid Force with Fail-Safe Design
The DBETBX employs a position-controlled proportional solenoid with high electromagnetic force output. Even in the extreme event of electronic component failure, the valve maintains maximum pressure limiting function through the solenoid’s mechanical characteristics, effectively preventing uncontrolled system pressure rise. This design significantly enhances system safety redundancy.

4. Wide Media Compatibility and Flexible Configuration
The DBETBX series supports multiple hydraulic fluid types including HL, HLP, HLPD, HVLP, HVLPD, and HFC. Seal material options include NBR (standard) and FKM (optional), accommodating mineral oils, environmentally friendly fire-resistant fluids, and other media types. Electrical connectors are available in 3-pin EN 175301-803 standard and DIN 43650-AM2 options, adapting to different OEM wiring harness standards.

5. Compact ISO 4401 Subplate Mounting Design
The DBETBX features NG6 size with a mounting interface compliant with ISO 4401-03-02-0-05. This standardized interface ensures compatibility with mainstream global hydraulic valve subplates and manifolds, enabling convenient installation and replacement. The compact valve body weighs approximately 4.1 kg, suitable for space-constrained hydraulic control cabinets.

6. IP65 Protection and Industrial Environment Adaptability
The DBETBX features IP65 protection, effectively resisting dust ingress and low-pressure water jets. The ambient operating temperature ranges from -20°C to +50°C with 100% duty cycle, ensuring reliable electrical performance and mechanical actuation under continuous industrial operating conditions.

Application Areas

• Variable Pump Pressure Control: Serves as a pilot control valve for stepless pressure limitation in variable pump systems

• Injection Molding Machine Hydraulic Systems: Precision proportional pressure limitation and regulation

• Presses and Forging Equipment: Stepless pressure setting and overload protection for hydraulic systems

• Metallurgical Equipment: Proportional pressure control for rolling mill hydraulic systems

• Testing and Laboratory Equipment: Hydraulic loading pressure control for material and fatigue testing machines

• Industrial Hydraulic Systems: Stepless system pressure limitation and safety protection for stationary equipment

• Mobile Hydraulic Systems: Proportional pressure control for construction and agricultural machinery hydraulic systems

Expert Maintenance Tips

1. Model Confirmation and Code Interpretation
Prior to installation, carefully verify the valve model code to confirm the following key parameters match system requirements:

• Pressure rating (315=315 bar): Confirm system maximum operating pressure does not exceed valve rating

• Supply voltage (G24=24V DC): Confirm system supply is 24V DC

• Seal material (M=NBR, V=FKM): Confirm compatibility with system hydraulic fluid

• Special configuration (-38=enhanced EMC/EMI protection): Confirm suitability for high electromagnetic interference environments

2. Fluid Cleanliness Management
The DBETBX series features poppet seat fit and LVDT position feedback mechanism, making it sensitive to fluid contamination. Recommended system fluid cleanliness is ISO 4406 18/16/13 or higher, with full-flow return line filters rated at 10 μm or finer, and regular fluid contamination testing.

3. Electrical Connection Inspection
The DBETBX uses a 3-pin (2+PE) connector per EN 175301-803. Prior to installation, verify:

• Supply voltage is 24 VDC with ripple not exceeding 5%

• Connector locking mechanism is fully engaged to prevent loosening due to vibration

• External control electronics (amplifier) model is compatible with the valve (DBETBX requires an amplifier with LVDT signal processing capability)

4. Pilot Oil Circuit — T-Port Connection
The DBETBX is a direct-operated pilot control valve with the solenoid interior connected to port T and filled with hydraulic fluid. During installation, ensure port T is reliably connected to the tank and the T-port back pressure does not exceed the valve’s allowable limit (maximum 250 bar). Excessive T-port back pressure will affect spool actuation accuracy.

5. Position Feedback Signal Verification
The DBETBX features a built-in LVDT position feedback sensor. After installation, verify the position feedback signal is functioning correctly:

• With no command signal (0 mA/0V), confirm the valve is closed with system pressure at minimum setting

• Gradually increase the command signal and observe whether system pressure rises linearly with the signal

• Feedback signal should exhibit good linear correspondence with the command signal

6. EMC/EMI Protection Considerations
DBETBX-1X/315G24-37Z4M-38 suffix -38 indicates enhanced EMC/EMI protection. In high electromagnetic interference environments (e.g., workshops with variable frequency drives), it is recommended to:

• Use shielded cables for control signals

• Ensure reliable valve body grounding

• Separate signal lines from power lines with adequate spacing

7. Contamination Prevention During Replacement
When replacing a DBETBX pilot valve, observe the following precautions:

• Thoroughly clean the area around the valve body before removal

• Immediately seal ports with clean plugs after removal to prevent contaminant entry into the hydraulic system

• Verify O-ring seals are intact before installing the new valve

• Prevent foreign objects from falling onto the valve mounting surface during installation

• Tighten mounting screws diagonally to specified torque

8. Spare Parts Strategy
It is recommended to keep 1-2 identical pilot valves as on-hand spares. The DBETBX series 1X component series maintains uniform mounting flange and port dimensions, allowing different pressure ratings or configuration variants to be interchanged on the same mounting interface for rapid field fault response. Note that different pressure ratings (e.g., 315 bar, 250 bar, 180 bar) use different setting springs and are not interchangeable.