Rexroth DBW10 Solenoid Relief Valve Replacement DBW10B DBW10A

The industrial-grade Rexroth Compatible DBW10 Series Solenoid Pilot Operated Pressure Relief Valves, engineered by Chengyuan Hydraulic, are premium, high-capacity fluid power control elements configured for maximum pressure containment and electronically actuated system unloading/bypass functions. Widely deployed across heavy industrial hydraulic power units (HPUs), automated metal forming presses, severe-duty plastic injection machinery, and comprehensive metallurgy foundry circuits, this valve series functions as both the primary system safety firewall and an energy-efficient unloader circuit controller.

This high-performance valve program targets the global B2B industrial component aftermarket and machinery manufacturing sectors, delivering 100% direct drop-in interchangeability with premium Rexroth standard engineering reference codes, including: DBW10B-1-30B/315 (offering heavy-duty pressure protection limits up to 315 bar) and DBW10A-1-50B/1006CG24N9Z5L (integrating a wet-pin 24V DC solenoid-operated directional pilot valve stage to complete highly accurate low-pressure system bypass).

Chengyuan’s alternative solenoid-controlled relief valves are manufactured in strict compliance with universal international ISO 6264 mounting standard subplate metrics. Critical physical operational boundaries—including the bolt-hole layout, electrical coil resistance matches, and the internal geometric configuration of pilot supply/drain routing channels—perfectly mirror native Rexroth technical manual criteria. On integrated automated production floors, field mechanics can execute rapid component changeouts immediately without modifying manifold baseblocks, rigid pipe lines, or PLC output wiring profiles.

In heavy continuous manufacturing frameworks, pressure control valves endure fast liquid velocity shearing, oil film carbonization inside the spool clearances from local temperature build-up, and constant physical shocks from high-frequency solenoid cycling. To ensure long-term field stability, 100% of Chengyuan’s DBW10 series valves undergo 100% strict dynamic simulation testing on digitized load blocks. Verified at continuous working pressures and 250 L/min maximum flows, every valve is certified for pilot-stage popping accuracy, millisecond-level spool shifting latencies, and minimal unloading residual pressure drop to eliminate premature failure under extreme workloads.

Technical Specifications

• Product Classification: Solenoid Pilot Operated Pressure Relief Valve / Subplate Mounted Pressure Control Valve

• Compatible Reference Platform Series: Seamless adaptation for Rexroth DBW10 product generations, including the standard 3X (e.g., 30B) and 5X (e.g., 50B) evolutionary series platforms

• Nominal Sizing Footprint & Standard Compliances: Size 10 mm (fully compliant with ISO 6264-06-09-0-97 / CETOP 06 subplate mounting interfaces)

• Maximum Continuous Flow Capacity: Volumetric continuous stream capacity delivers up to 250 L/min

• Maximum Permissible Circuit Pressure Adjustment Limits:

  • Model Variant DBW10B-1-30B/315: Relief limiting capacity up to 315 bar (31.5 MPa)

  • Model Variant DBW10A-1-50B/100…: Relief limiting capacity up to 100 bar (10 MPa)

• Technical Model Coding Decoupling & Precision Parameters:

  • Replacement Reference: DBW10B-1-30B/315

    • Configuration: Size 10 mm subplate relief valve; “B” specifies standard structural platform parameters; “1” denotes internal pilot oil supply from port P and internal pilot oil drainage back to port T; “30B” represents the 30-to-39 technical design modification series; “/315” indicates an integrated high-stiffness heavy pressure spring locking the safety threshold maximum to 315 bar.

  • Replacement Reference: DBW10A-1-50B/1006CG24N9Z5L

    • Configuration: Size 10 mm advanced evolutionary relief valve; “A” marks the optimized series structural design; “50B” marks the 50-to-59 design iteration platform; “/100” signifies a maximum pressure regulation range limited to 100 bar; “6C” identifies a top-mounted Size 6 (WE6) directional pilot valve featuring a standard C-spool function (managing main spool transitions between pressure relief and unpressurized bypass modes); “G24” represents a high-torque wet-pin DC 24V solenoid block; “N9” signifies the integration of a manual mechanical override pin; “Z5L” denotes a large rectangular DIN Hirschmann connector junction incorporating an LED operational status indicator light.

• Maximum Permissible Return Tank Line Back-Pressure (T Port): Accommodates continuous back-pressures up to 315 bar during continuous bypass operation

• System Fluid Compatibility & Thermal Limits: Accommodates mineral-based hydraulic fluids (compliant with HLP anti-wear standards), spanning fluid operational temperatures from -30°C to +80°C

• Component Net Weight: Standard single-solenoid configuration configuration is approx. 4.8 kg

Key Technical Advantages

• Two-Stage Main Spool with Low-Resistance Precision Damping: The main sliding spool incorporates a laser-drilled, micro-calibrated flow damper orifice inside its core channel. When the main circuit breaches the designated safety limit, the spool lifts within milliseconds, providing a wide fluid path that ensures excellent pressure stability and eliminates fluid resonance or high-frequency acoustic whining.

• CFD-Optimized Ductile Iron Housing for Minimal Unloading Pressure Drops: The subplate mounting block body is cast from high-tensile ductile iron using a refined shell-molding architecture. By tailoring the internal fluid chambers from port P to port T via computational fluid dynamics, the residual pressure drop during the unpressurized unloading cycle is reduced by over 12%. This minimizes circuit power loss and curbs system temperature buildup during long idle cycles.

• Wet-Pin Maintenance-Free Solenoid Pilot Control Valve Assembly: The integrated WE6 directional pilot stage utilizes an electromagnetic armature operating fully submerged inside a fluid-filled armature sleeve. This wet-pin configuration removes vulnerable external dynamic shaft-seals, preventing external leakage while lowering mechanical switching noise and maximizing thermal dissipation to survive millions of cycles.

• Micro-Finished Alloy Steel Anti-Erosion Pilot Poppet & Seat Assembly: The high-pressure pilot regulating stage is machined from premium hardened alloy steel, finished via spherical micro-grinding and induction heat treatment. This secures a tight metal-to-metal seal, holding internal pilot bypass leakage to near-zero before reaching cracking pressure to optimize system volumetric efficiency.

Application Areas

Chengyuan’s high-performance replacement Rexroth DBW10 series solenoid-controlled pressure relief valves deliver exact pressure regulation and dependable system protection across demanding applications:

• Central Industrial Hydraulic Power Units (HPUs): Positioned at the primary pump discharge to provide ultimate system overpressure safety and low-pressure electrical startup capability.

• Heavy Sheet Metal Forming Hydraulic Presses & Scrap Balers: Governing multi-stage cylinder flow during high-pressure pressing, system decompression, and subsequent low-pressure return travel loops.

• Automated Steel Mill Blast Furnaces & Rolling Mill Servo Circuits: Functioning as a high-reliability safety valve operating continuously under severe ambient radiant heat, high vibration, and multi-shift workloads.

Expert Maintenance Tips

• When Reassembling the Top Pilot Solenoid Stage Onto the Main Relief Sub-Body After Field Cleaning, Ensure the Micro Pilot O-Rings and Internal Control Orifice Plugs Are Perfectly Aligned: If the micro control fluid plug is omitted, positioned incorrectly, or blocked by contaminants during field service, the static pressure balance across the main spool will be compromised. This results in the system failing to generate pressure (stuck in a low-pressure unloading state) or locking completely into an overpressure condition.

• Torque the Four Class 12.9 High-Tensile Mounting Bolts (M10 Size) Uniformly in a Cross-Pattern Grid to the Recommended Metric Limit of 70 N·m: Because the fit clearance between the main sliding spool and the internal bore is held to single-digit microns, uneven torque loads will warp the ductile iron housing. This minor distortion increases spool friction and causes shifting resistance, leading to sluggish pressure building or elevated hysteresis.

• If the Valve Fails to Unload via Electronic Control or if Fluid Temperatures Spike and Cause Excessive Tank Overheating, Verify the Solenoid Power and Inspect the Main Spool for Thermal Binding: If the hydraulic oil degrades or accumulates micro-scale particulate sludge, debris can cluster at the primary damping orifice. If this causes the main spool to stick and prevents it from shifting to its full open profile, the main bypass stream is forced through a partial restriction, shearing the oil and creating extreme thermal energy that can degrade system fluid within hours.