DBW10 DBW20 Series Solenoid Pilot Operated Relief Valve | Rexroth Replacement | 31.5 MPa High Pressure

The DBW Series by Chengyuan Hydraulic is a premium pilot-operated solenoid relief valve designed for precise system pressure regulation and solenoid-actuated unloading. Fully compatible with Rexroth 5X and 6X series standards, these valves offer 100% original-place interchangeability for DBW10 and DBW20 models. By integrating a pilot stage with a directional solenoid valve, the DBW series enables easy switching between pressure-holding and unloading modes. Each unit is subjected to 100% simulated condition testing, guaranteeing superior pressure stability and dynamic response for even the most demanding industrial environments.

Technical Specifications 

• Series Code: DBW10A, DBW20A (Pilot Operated)

• Nominal Sizes: NG10 (CETOP 5), NG20 (CETOP 8)

• Max Operating Pressure: 35 MPa (350 bar / 5076 psi)

• Adjustable Pressure Range: Up to 31.5 MPa (315 bar)

• Maximum Flow Rate:

  • DBW10: Approx. 250 L/min

  • DBW20: Approx. 500 L/min

• Control Voltages: DC 24V (G24), AC 220V (W220)

• Connection Type: Standard Subplate Mounting

• Manual Override: Included as standard (N9/N-code)

• Ingress Protection: IP65 Rated Solenoids

Key Technical Advantages

• High-Dynamic Pilot Response: The pilot stage features a precision-ground poppet design paired with optimized damping orifices. This ensures rapid actuation and minimizes pressure spikes during solenoid switching, protecting downstream components.

• Flow-Optimized Casting: Utilizing high-strength EN-GJS-400 ductile iron, the valve body’s internal channels are CFD-optimized to reduce pressure drop. This leads to higher energy efficiency and quieter operation under full load.

• Heavy-Duty Wet-Pin Solenoids: Equipped with industrial-grade wet-pin solenoids. The armature operates in oil for superior cooling and vibration damping, ensuring over 10 million cycles of service life.

• 100% Full-Pressure Reliability: Every DBW valve from Chengyuan is tested under peak 31.5 MPa simulated loads. We verify zero internal leakage and zero pressure drift, ensuring the valve maintains its settings for years.

Application Areas

• Hydraulic Power Units (HPU): Ideal for pump startup unloading and circuit protection.

• Industrial Presses: Used in forging, stamping, and metal recycling equipment for multi-stage pressure control.

• Steel & Metallurgy: Critical safety and unloading control for furnace movements and rolling mills.

Expert Maintenance Tips

• Air Bleeding: During initial commissioning, always bleed the air from the pilot circuit via the bleed screw to prevent erratic pressure fluctuations or oscillations.

• Voltage Stability: For DC 24V models, ensure that the power supply stays within ±10% of the nominal voltage to avoid solenoid burnout or failure to unload.

• Filtration Standard: Maintain fluid cleanliness at ISO 4406 19/17/14 or better. Proportional and pilot-operated valves are sensitive to contamination that could clog internal damping orifices.