Rexroth DB10 DB20 DB30 Relief Valve | DB10-1-50B/315 DB20-2-5X/200

The Rexroth DB Series from LIC Hydraulic is a sophisticated Pilot Operated Pressure Relief Valve engineered to limit the maximum pressure in hydraulic systems. Comprising a main valve and a pilot control section, models like the DB10-1-50B/315 and DB20-2-5X/200 are designed for high-flow applications requiring stable pressure regulation. We offer units that are 100% mechanically interchangeable with original Rexroth standards. Every valve is subjected to 100% cracking pressure and internal leakage testing, ensuring peak performance as the primary safety component in your hydraulic circuit.

Technical Specifications (Bulleted List)

• Series: Rexroth DB10, DB20, DB30 (5X/50B Series)

• Nominal Sizes: $10, 20, 30$

• Max Flow Rate: $250\text{ to }650\text{ L/min}$ (depending on size)

• Max Operating Pressure: $315\text{ bar}$ ($4500\text{ psi}$) or $350\text{ bar}$

• Pressure Stages: $50, 100, 200, 315\text{ bar}$

• Control Mechanism: Pilot Operated

• Mounting Type: Subplate Mounting (to ISO 6264)

• Adjustment: Rotary knob, grub screw, or lockable handwheel

Key Technical Advantages

• Superior Pressure Stability: Unlike direct-acting valves, the pilot-operated design ensures that the system pressure remains consistent regardless of flow variations, preventing harmful pressure spikes.

• High-Capacity Flow Paths: The DB20 and DB30 sizes are optimized for large-scale HPUs, featuring main spools that handle massive flow volumes with minimal pressure drop and maximum stability.

• Noise Reduction Technology: Precision-ground pilot cones and integrated damping orifices effectively suppress high-frequency “squealing” and vibrations during high-pressure relief cycles.

• Modular Versatility: The subplate mounting design allows for easy integration and replacement, while various adjustment options cater to different safety and ergonomic requirements.

Application Areas

• Industrial Power Units (HPUs): Serving as the main safety relief valve for pump protection.

• Heavy Presses: Ensuring constant pressure maintenance and overload safety in forging and stamping.

• Metallurgical Plants: Precision pressure compensation for rolling mill hydraulic circuits.

• Plastic Machinery: Controlling injection pressure limits in molding machines.

Expert Maintenance Tips

• Pilot Orifice Maintenance: Pilot-operated valves are highly sensitive to oil contamination. Even microscopic debris can clog the pilot orifice, leading to “no pressure” or “overpressure” failures. Maintain a filtration level of ISO 18/16/13.

• Remote Port (X) Handling: For models with a remote control port (e.g., DB20…X), ensure the port is properly plugged if not connected to a remote pilot valve. An open port will prevent the main spool from closing, resulting in a loss of system pressure.

• Thermal Monitoring: Frequent or continuous relief activity generates significant heat. Monitor your oil temperature and ensure that the valve seals (preferably FKM/Viton) are inspected regularly for thermal degradation to prevent external leaks.