Rexroth DBW DB Series High Pressure Relief Valve | R930006737 R901109805 R934001189

Chengyuan Hydraulic presents a high-performance series of pressure relief valves, precisely engineered to meet the industrial standards of Rexroth. This series covers critical part numbers including R930006737 (DBW type), R901109805, and R934001189 (DB type). These valves serve as the primary safety and pressure control components in hydraulic circuits, providing pressure limitation and unloading functions. Chengyuan guarantees 100% Drop-in Interchangeability regarding ISO 6264 mounting interfaces, thread specifications, and dynamic regulation characteristics. Backed by our 100% Simulation Load Testing, each valve is calibrated for opening pressure accuracy and leakage control, ensuring vital protection for metallurgical, power, and heavy machinery systems.

Technical Specifications 

• Compatible Brand: Rexroth

• Part Numbers: R930006737, R901109805, R934001189, R901113684, R934003877, R934004903

• Series Types: DB (Pilot-operated) / DBW (With integrated solenoid valve)

• Nominal Size (NG): 10, 25, 32

• Max Operating Pressure: 315 Bar (31.5 MPa)

• Maximum Flow: 250 L/min to 600 L/min (Size dependent)

• Unloading Voltage (DBW): DC 24V / AC 220V options

• Adjustment Type: Rotary knob / Adjustment screw with protective cap

• Mounting Configuration: Subplate Mounting

Key Technical Advantages:

• Hardened Tungsten-Carbide Spool Paring: The internal pilot spool is crafted from deep heat-treated alloy steel with precision-lapped conical seating. This ensures maximum sealing integrity even under frequent 31.5MPa actuation, effectively preventing actuator drift.

• Optimized Orifice Design: The internal flow channels are simulation-optimized. Combined with precision-machined damping orifices, the design suppresses pressure pulsation and high-frequency noise during relief, enhancing system stability.

• Rapid Solenoid Response (DBW Series): The DBW type incorporates a high-performance directional valve. Chengyuan’s optimized coil design ensures low heat generation during continuous operation and millisecond-level response for emergency system unloading.

• Anti-Corrosion Finish: The valve body features a phosphate or nickel-chrome finish, and the internal springs undergo fatigue-life enhancement. This allows the product to maintain precise pressure regulation in humid, high-temperature, or dusty industrial environments.

Application Areas:

• Heavy Duty HPUs: Steel mill rolling mill controls and power plant turbine oil stations.

• Construction Equipment: TBM excavation pressure control and main relief systems for large hydraulic cranes.

• Industrial Presses: Overload protection for forging machines, balers, and molding presses.

• Marine Engineering: Winch hydraulic systems and steering gear power units.

Expert Maintenance Tips:

• Pressure Setting Protocol: Before system startup, loosen the adjustment knob to its lowest setting. Start the pump and slowly tighten until the required pressure is reached. Avoid rapid, high-torque adjustment under pressure to protect the pilot seat.

• Pilot Orifice Cleaning: If pressure fluctuations occur, the pilot damping orifice may be clogged. Remove the pilot stage and clean with compressed air. This usually restores function without needing a full valve replacement.

• Seal Inspection Cycle: Due to local heat generation during relief operations, inspect the O-rings (FKM) on the mounting interface every 2000 hours to prevent external leaks caused by seal aging.