DBW10B2-5X/200-6EG24N9K4 | Rexroth Solenoid Relief Valve 350bar 160L/min

Product Overview

The DBW10B2-5X/200-6EG24N9K4, DBW10B2-5X/315-6EG24N9K4, and DBW10B-1-50/CW220NZ5L are classic models in the Bosch Rexroth DBW series of pilot-operated solenoid relief valves, NG10 (CETOP 5) size, with mounting pattern conforming to ISO 6264-06-09 (NG10). The DBW series is a pilot-operated relief valve that integrates a solenoid directional valve for remote solenoid-actuated system pressure unloading—used for limiting maximum system pressure and enabling remote unloading.

The DBW series valve consists of three main components: the main valve (with main spool insert), the pilot control valve (with pressure adjustment element), and the integrated directional spool valve. The DBW10B2-5X/200-6EG24N9K4 and DBW10B2-5X/315-6EG24N9K4 feature B2 spool symbol (P→T flow path), 5X component series (50–59 series), and 24V DC supply. The DBW10B-1-50/CW220NZ5L features 50 series design with AC220V supply.

The DBW10B2-5X/200-6EG24N9K4 (Material Number R900912910) has a maximum pressure setting of 200 bar. The DBW10B2-5X/315-6EG24N9K4 (Material Number R900906285) has a maximum pressure setting of 315 bar. Both have a maximum operating pressure of 350 bar.

As original Bosch Rexroth pilot-operated solenoid relief valves, these products offer complete interchangeability within the same series and size, requiring no modifications to mounting interfaces or piping layouts.

Model Code Breakdown (using DBW10B2-5X/200-6EG24N9K4 as an example)：

• DBW: Pilot-operated pressure relief valve with solenoid unloading

• 10: Nominal Size NG10 (10 mm)

• B2: Spool symbol and configuration (B type, P→T flow path)

• 5X: 5X Component Series (50–59, unchanged installation and connection dimensions)

• 200 / 315: Pressure setting (200 bar / 315 bar)

• 6E: With wet-type solenoid

• G24: DC 24V supply (G = DC)

• N: NBR seals

• K4: Without mating connector (DIN EN 175301-803 connector)

Technical Specifications 

DBW10B2-5X/200-6EG24N9K4 Specifications:

• Model: DBW10B2-5X/200-6EG24N9K4

• Material Number: R900912910

• Brand: BOSCH REXROTH

• Series: DBW Series, 5X Component Series

• Product Type: Pilot-operated Solenoid Relief Valve

• Spool Symbol: B2 type (P→T)

• Nominal Size: NG10 (10 mm)

• Mounting Standard: ISO 6264-06-09 (NG10)

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 350 bar (5075 psi) 

• Maximum Flow Rate: 160 L/min (42 GPM) 

• Maximum Pressure Setting: 200 bar (2900 PSI) 

• Coil Voltage: 24V DC

• Solenoid Type: Wet-Type Solenoid

• Electrical Connector: DIN EN 175301-803 (K4)

• Protection Class: IP65 (with properly installed connector)

• Seal Material: NBR

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC

• Adjustment Types: Multiple options (rotary knob, hexagon sleeve, etc.)

• Weight: 4.5 kg

DBW10B2-5X/315-6EG24N9K4 Specifications:

• Model: DBW10B2-5X/315-6EG24N9K4

• Material Number: R900906285

• Brand: BOSCH REXROTH

• Series: DBW Series, 5X Component Series

• Product Type: Pilot-operated Solenoid Relief Valve

• Spool Symbol: B2 type (P→T)

• Nominal Size: NG10 (10 mm)

• Mounting Standard: ISO 6264-06-09 (NG10)

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 350 bar (5075 psi) 

• Maximum Flow Rate: 250 L/min (66 GPM) 

• Pressure Setting Range: 4–315 bar

• Maximum Pressure Setting: 315 bar (4569 psi) 

• Coil Voltage: 24V DC

• Solenoid Type: Wet-Type Solenoid

• Electrical Connector: DIN EN 175301-803

• Protection Class: IP65 (with properly installed connector)

• Seal Material: NBR

• Hydraulic Fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC

• Weight: 4.59 kg

DBW10B-1-50/CW220NZ5L Specifications:

• Model: DBW10B-1-50/CW220NZ5L

• Brand: BOSCH REXROTH

• Series: DBW Series, 50 Component Series

• Product Type: Pilot-operated Solenoid Relief Valve

• Spool Symbol: B type (P→T) 

• Nominal Size: NG10 (10 mm)

• Mounting Standard: ISO 6264-06-09 (NG10)

• Mounting Type: Subplate Mounting

• Maximum Operating Pressure: 350 bar (5075 psi)

• Maximum Flow Rate: 160 L/min (42 GPM)

• Coil Voltage: AC220V (50/60Hz)

• Solenoid Type: Wet-Type Solenoid

• Seal Material: NBR

Key Technical Advantages

1. Pilot-Operated Design — High-Pressure High-Flow with Precise Control

The DBW10 series features pilot-operated construction—the main valve is controlled by a pilot control valve. Compared to direct-acting relief valves, the pilot-operated design delivers superior pressure/flow stability, lower hysteresis, and more precise pressure control. Maximum flow reaches 250 L/min (DBW10B2-5X/315-6EG24N9K4)  or 160 L/min (DBW10B2-5X/200-6EG24N9K4) .

2. Integrated Solenoid Unloading — Remote Pressure Control

The DBW series adds a solenoid directional valve to the DB series relief valve, enabling remote solenoid-actuated system pressure unloading. When energized, the directional valve actuates, unloading system pressure to tank through the pilot valve. This allows the DBW valve to serve both as a system safety valve and a remote unloading valve.

3. B Spool Symbol — Direct P→T Unloading Flow Path

The DBW10B2-5X/200-6EG24N9K4, DBW10B2-5X/315-6EG24N9K4, and DBW10B-1-50/CW220NZ5L all feature B spool symbol (P→T flow path). When the solenoid is energized, pressure oil at the P port flows directly to the T port for rapid system pressure release. The B configuration is ideal for applications requiring direct unloading to tank.

4. 5 Pressure Grades with Multiple Adjustment Types

The DBW10 series offers 5 pressure grades (50, 100, 200, 315, 350 bar). The DBW10B2-5X/315-6EG24N9K4 covers a pressure setting range of 4–315 bar. 4 adjustment types are available: rotary knob, sleeve with hexagon and protective cap, lockable rotary knob with scale, and rotary knob with scale.

5. NBR Seals with Multi-Fluid Compatibility

Equipped with NBR seals, compatible with HL, HLP, HLPD, HVLP, HVLPD, HFC, and other hydraulic fluids. Suitable for mineral oil and water-containing fluid systems.

6. International Standard Compliance for Global Interchangeability

Mounting conforms to ISO 6264-06-09 international standards. The DBW series offers complete interchangeability with Parker, Eaton/Vickers, Atos, and other major brands.

7. Optional Switching Shock Damping for Reduced System Noise

Optional switching shock damping mitigates pressure peaks and acoustic decompression shocks in return lines by delaying the opening from B to T. This feature is particularly beneficial for reducing system noise and enhancing performance stability.

Application Areas

• Fixed-Displacement Pump Systems — System pressure limiting and remote unloading control

• Injection Molding Machinery — System pressure setting and unloading

• Hydraulic Presses and Forging Equipment — System pressure limiting and remote unloading

• Die-Casting Machines — Pressure control for high-pressure casting equipment

• CNC Machine Tools — Hydraulic system pressure limiting and unloading

• Industrial Automation Production Lines — Hydraulic systems requiring remote pressure unloading

• Steel and Mining Equipment — Pressure control for rolling mills and heavy-duty systems

Expert Maintenance Tips

1. Installation Guidelines

• Mounting surface must conform to ISO 6264-06-09 (NG10) standards.

• Thoroughly clean the mounting surface and all ports (P, T) before installation to prevent foreign particles from entering and causing spool sticking or seal damage.

• Tighten mounting bolts evenly to the specified torque to ensure proper sealing between the valve body and mounting surface.

• K4 suffix indicates without mating connector — users must separately select a compatible DIN EN 175301-803 connector.

2. Hydraulic Fluid Cleanliness

• Compatible fluids: HL, HLP, HLPD, HVLP, HVLPD, HFC.

• Seal material: NBR.

• Install a return line filter with minimum 10 μm filtration rating.

3. Pressure Setting Adjustment

• DBW10B2-5X/200-6EG24N9K4 factory pressure setting: 200 bar.

• DBW10B2-5X/315-6EG24N9K4 factory pressure setting: 315 bar, setting range 4–315 bar.

• Pressure adjustment is performed via the adjustment element on the pilot valve—turn clockwise to increase, counterclockwise to decrease.

• Adjust gradually under system operating conditions to achieve the desired pressure value.

4. Electrical Connection Specifications

• DBW10B2-5X/200-6EG24N9K4 and DBW10B2-5X/315-6EG24N9K4 use 24V DC supply.

• DBW10B-1-50/CW220NZ5L uses AC220V (50/60Hz) supply.

• Electrical connector: DIN EN 175301-803 standard.

• Ensure the connector is fully locked to maintain IP65 protection.

5. Solenoid Unloading Function Usage

• When the DBW series solenoid is energized, system pressure is unloaded to tank pressure through the pilot valve.

• When de-energized, the valve returns to normal relief function.

• The unloading function can be used for system standby energy saving or emergency pressure release.

• Note: With B configuration, in case of power failure or cable break, pressure drops to the minimum adjustable setting (circulation pressure).

6. Periodic Maintenance Inspection

• Inspect the valve body for external oil leakage every 2,000 operating hours or at least annually.

• Check electrical connectors for looseness, oxidation, or moisture ingress.

• If pressure control instability or slow response is observed, first check system fluid cleanliness and verify the pilot spool is not sticking.

• Periodically check the pilot stage orifice for blockage (DBW series valves feature a damping orifice that affects dynamic response characteristics).