Rexroth DBW Series Relief Valve | DBW30B-1-50B | Solenoid Actuated Relief Valve

The DBW Series pilot-operated solenoid-controlled relief valves by Chengyuan Hydraulic are precision pressure control components fully compatible with Rexroth 5X Series industrial standards. Featuring models such as DBW30B-1-50B-315, these valves are engineered for system pressure protection and multi-stage unloading control. By utilizing the integrated solenoid directional valve, the hydraulic system can switch seamlessly between the preset relief pressure and a zero-pressure (unloading) state. Every DBW valve is manufactured with high-strength castings and undergoes 100% simulated load testing, ensuring sensitive response and vibration-free operation for a 100% original-place interchangeable solution.

Technical Specifications :

• Core Models: DBW10, DBW20, DBW30 (e.g., DBW30B)

• Nominal Size (NG): $30\text{ mm}$ (for high-flow systems)

• Max Operating Pressure: $31.5\text{ MPa (315 bar / 4500 psi)}$

• Max Flow Rate: Up to $650\text{ L/min}$ (for Size 30)

• Control Voltages: G24 (DC 24V), W220 (AC 220V), G12 (DC 12V)

• Adjustment Types: 1 (Hand knob), 2 (Protective cap with lock)

• Seal Material: NBR or FKM (Viton)

• Mounting Interface: ISO 6264 compliant subplate mounting

Key Technical Advantages:

• Pilot-Operated Stability: The two-stage design (main and pilot valve) ensures a minimal pressure override. This results in superior pressure stability across a wide flow range, preventing localized overheating caused by pressure fluctuations.

• Rapid Solenoid Unloading Response: The integrated 3WE solenoid valve utilizes oil-immersed solenoids. Its millisecond-level response time allows for instantaneous unloading via PLC signals, protecting motors from starting or stopping under load.

• Anti-Vibration Damping Design: The main spool features precision-drilled damping orifices that effectively filter pressure pulsations from the pump. This ensures smooth spool movement and significantly reduces resonance noise within the hydraulic circuit.

• High-Reliability Coil Construction: Solenoid coils feature Class F insulation and IP65 protection. They maintain consistent electromagnetic force even in high-temperature or dusty industrial environments, ensuring fail-safe unloading logic.

Application Areas:

• Large Press Systems: Automatic unloading for forging presses and balers during non-working cycles.

• Centralized Pump Stations: Serving as a main safety valve with remote control unloading capabilities.

• Heavy Machinery: High/Low pressure circuit control for injection molding and die-casting machines.

Expert Maintenance Tips:

• Pilot Drain Backpressure: The Y-port (pilot drain) must typically lead directly back to the tank. Excessive backpressure in the drain line will cause set-pressure drift or incomplete unloading.

• Orifice Cleanliness: The precision pilot orifices are sensitive to contamination. Maintain a filtration rating of $10\mu\text{m}$ to prevent spool sticking, which can result in the system being unable to build pressure or unload.

• Solenoid Bleeding: When replacing coils or during commissioning, ensure the solenoid armature chamber is bled of air to minimize hydraulic shock and operational noise.