Rexroth DB10 DB20 DB30 Series Hydraulic Relief Valve | DB10-1-5X/315 Pilot Operated Pressure Valve

Chengyuan Hydraulic presents the DB Series (DB10, DB20, DB30) pilot-operated relief valves, precision-engineered as premium replacements for Bosch Rexroth industrial standards. These valves are critical for pressure control and safety protection in heavy-duty hydraulic systems. Our models, such as the DB10-1-5X/315 and DB30G, are designed with a focus on 100% mechanical and functional interchangeability. By adhering to original engineering blueprints and utilizing our proprietary 100% dynamic load testing protocols, we ensure that every valve provides high sensitivity and reliable pressure regulation, even under extreme flow conditions.

Technical Specifications

• Compatible Brand: Bosch Rexroth Standard

• Core Model Codes: DB10, DB20, DB30 (e.g., DB10-1-5X/315, DB30G-2-5X/315)

• Nominal Sizes: Size 10, Size 20, Size 30

• Max. Operating Pressure: 315 bar (4568 psi)

• Max. Flow Rate:

  • DB10: Approx. 250 L/min (66 gpm)

  • DB20: Approx. 500 L/min (132 gpm)

  • DB30: Approx. 600 L/min (158 gpm)

• Pressure Adjustment Stages: Up to 50, 100, 200, or 315 bar

• Mounting Types: Subplate mounting, Threaded connection, or Manifold block mounting

• Control Method: Pilot-operated (Hand knob or socket screw adjustment)

• Fluid Compatibility: Mineral oils (HL, HLP) according to DIN 51524

Key Technical Advantages:

• Superior Pilot Precision: The optimized pilot stage design ensures a very low pressure-override gradient, maintaining constant system pressure regardless of flow fluctuations.

• Wear-Resistant Valve Seat: The main spool and seat are manufactured from high-hardness alloy steel with vacuum heat treatment and precision honing, ensuring zero leakage and long-term durability.

• Low-Noise Flow Dynamics: The internal cavity is aerodynamically contoured to minimize turbulence and cavitation, significantly reducing operational decibels during high-pressure relief cycles.

• High-Fatigue Springs: Utilizing imported Si-Cr alloy spring steel with shot-peening treatment, our springs retain constant tension over millions of cycles, ensuring the set pressure does not drift over time.

Application Areas:

• Heavy-Duty Hydraulic Power Units: Primary pressure limiting for motor and pump protection.

• Injection Molding Machines: Precise clamping and injection pressure control.

• Metallurgical & Forging Presses: Safety and sequence control for large-scale extrusion and shearing machinery.

• Marine & Offshore Engineering: Reliable pressure regulation in harsh, corrosive, and high-duty environments.

Expert Maintenance Tips:

• Filtration Maintenance: Pilot-operated valves are sensitive to particulates. Ensure system filtration meets ISO 4406 20/18/15 standards to prevent clogging of the pilot damping orifices.

• Safe Pressure Adjustment: Always adjust the pressure settings gradually from low to high. Avoid rapid or extreme rotations of the adjustment knob while the system is under full load.

• Seal Integrity: Inconsistent pressure readings often indicate worn pilot O-rings. Inspect seals every 2,000 operational hours for signs of thermal aging or compression set.