Rexroth DBW10 Series Electromagnetic Relief Valve | DBW10A2 DBW10B2 | Solenoid Operated Pressure Valve

The DBW10 Series pilot-operated electromagnetic relief valves from Chengyuan Hydraulic are high-performance pressure control components fully compatible with Rexroth industrial standards. This series integrates a pilot relief valve with a directional solenoid valve, enabling both precise system pressure setting and solenoid-controlled unloading for no-load starting or emergency shutdown. For core models like DBW10A2-5X/315 (Normally Open unloading) and DBW10B2-4X/200 (Normally Closed unloading), we have optimized the main spool damping orifice to minimize pressure fluctuations during switching. Every valve undergoes 100% simulated condition testing to verify that pressure stability and solenoid reliability match OEM standards, ensuring 100% original-place interchangeability.

Technical Specifications :

• Nominal Size: 10 (NG10 / CETOP 05)

• Model Codes: DBW10A2-5X/315U6EG24N9K4, DBW10B2-41/200…

• Max Operating Pressure: 315 bar / 350 bar (series dependent)

• Max Flow Rate: Up to 250 L/min

• Pressure Adjustment Ranges: 50 bar, 100 bar, 200 bar, 315 bar, 350 bar

• Solenoid Voltages: G24 (24V DC), W230 (230V AC)

• Electrical Connection: K4 (ISO 4400 Plug)

• Unloading Logic: Type A (De-energized unloading), Type B (Energized unloading)

• Mounting Pattern: Subplate mounting to ISO 6264

Key Technical Advantages:

• Stable Pilot-Operated Relief: Utilizing a two-stage design (pilot + main stage), the valve maintains exceptional pressure accuracy and low cracking pressure even under high-flow conditions. The main spool is crafted from high-alloy steel and precision-ground for smooth operation without binding.

• Efficient Solenoid Unloading: The integrated directional valve features a wet-pin DC solenoid for rapid and smooth response. This allows the DBW10 to function as both a safety valve and a pump unloading valve, significantly reducing energy consumption and oil heat buildup.

• Multi-Series Compatibility: Whether from the 5X or 4X design series, Chengyuan’s DBW valves strictly follow ISO 6264 standards for mounting interfaces and pilot oil layouts, ensuring a “drop-in” replacement for existing Rexroth units.

• 100% Dynamic Validation: Since the DBW valve is critical for system protection, we test not only the static pressure-flow curves but also the transient pressure shocks during unloading to ensure no destructive water hammer occurs during switching.

Application Areas:

• Industrial Presses: Main system pressure regulation and unloading for hydraulic presses.

• Hydraulic Power Units (HPU): Pressure limit protection for standardized industrial power packs.

• Plastics Machinery: Pressure management for auxiliary pumps and cooling circuits.

Expert Maintenance Tips:

• Orifice Cleanliness: The main spool damping orifice is very small (0.8-1.2mm). Contaminants can easily cause unloading failure. High-precision filtration (10μm) is mandatory.

• Manual Override Usage: A manual push-button is provided on the solenoid. During commissioning or power loss, this can be used to manually trigger the unloading logic for troubleshooting.

• Mounting Interface Integrity: The subplate mounting surface must have a flatness better than 0.01mm/100mm and a roughness of Ra 0.8 or better to prevent seal extrusion under high pressure.