Rexroth DBW10 DBW20 Solenoid Relief Valve | 315 Bar Pilot-Operated

The DBW Series solenoid-actuated, pilot-operated relief valves from Chengyuan Hydraulic are precision-engineered as high-end replacements for the Rexroth 5X series standards. By integrating a pilot-operated relief valve with a top-mounted directional solenoid valve, this series offers dual functionality: precise system pressure regulation and remote electrical unloading. Covering key models such as DBW10B and DBW20A, our products ensure 100% Drop-in Interchangeability in terms of mounting geometry, spool functionality, and dynamic response. Every unit undergoes Chengyuan’s signature 100% Simulation Load Testing, verifying switching stability and zero-leakage performance under a continuous 315 Bar load—providing a rock-solid pressure barrier for heavy-duty industrial power units.

Technical Specifications 

• Compatible Brand: Rexroth 5X Series

• Primary Models: DBW10B-1-5X, DBW20A-1-5X

• Nominal Sizes: NG10 (Size 10) / NG25 (Size 20)

• Maximum Operating Pressure: 315 Bar (31.5 MPa)

• Max Flow Rate (NG10): 250 L/min

• Max Flow Rate (NG25): 500 L/min

• Pilot Stage: Integrated WE6 directional solenoid valve

• Control Voltage: DC 24V / AC 220V (Standard options)

• Pressure Adjustment Range: 50 Bar to 315 Bar

• Mounting Standard: Subplate mounting compliant with ISO 6264

Key Technical Advantages:

• Micron-Level Spool Honing: The main spool and sleeve are crafted from high-strength alloy steel, featuring deep-layer carburizing and ultra-precision honing. This tight tolerance ensures minimal internal leakage and rapid response at 315 Bar, effectively preventing system overheating caused by fluid bypass.

• Smooth Unloading Logic: The internal pilot flow paths are optimized via CFD (Computational Fluid Dynamics) to minimize hydraulic shocks (Pressure Spikes) during solenoid transitions. This “soft-shift” characteristic protects the pump source and significantly extends the lifespan of piping and seals.

• Ductile Iron High-Pressure Housing: Cast from high-grade ductile iron, the valve body offers exceptional fatigue resistance. It maintains structural integrity even under high-frequency loading/unloading cycles, ensuring maximum safety in demanding industrial environments.

• Full-Load Simulation Validation: Unlike standard static tests, Chengyuan performs 100% simulated load switching tests on every DBW valve. This ensures the solenoid magnetic force and spring return force are perfectly synchronized under high temperature and pressure conditions.

Application Areas:

• Heavy-Duty Hydraulic Stations: Remote pressure setting and no-load starting for large-volume pump groups.

• Forging & Stamping Presses: Providing precise overload protection during drawing and stamping cycles.

• Metallurgical Lines: Pressure control and safety circuits in ironmaking and steel rolling equipment.

• Injection Molding: Enabling high-efficiency pressure holding and rapid system unloading.

Expert Maintenance Tips:

• Cleanliness is Critical: The pilot damping orifices are extremely small. Maintain system fluid cleanliness at NAS Grade 8 or better. If the pressure fails to adjust or unload, prioritize checking for clogging in the pilot stage.

• Solenoid Inspection: Periodically verify the tightness of the solenoid junction box. In humid or dusty environments, use connectors with IP65 protection or higher to prevent electrical failure.

• Spring Fatigue Monitoring: After 2 years of high-frequency operation, inspect the pilot-stage pressure spring’s elasticity to ensure consistent linearity in pressure adjustments.