DBDH 6 G1X/315 Rexroth Pressure Relief Valve Direct Operated 315 bar

Model 1: DBDH 6 G1X/315

Product Overview

The DBDH 6 G1X/315 is a direct-operated seat-type pressure relief valve from Bosch Rexroth’s DBD series. Designed to limit system pressure in hydraulic applications, the valve opens when the pressure in channel P exceeds the spring set value, allowing fluid to flow from channel P to channel T. The DBDH 6 G1X/315 features a poppet with damping piston for pressure ratings up to 315 bar, delivering superior sealing performance and fast response characteristics. The “KX” version is specifically designed for poppet seat valve applications with pressure ratings up to 315 bar. This model supports both screw-in cartridge and subplate mounting configurations for NG6 cavities. Component Series X certification ensures reliability and performance consistency across all applications.

Technical Specifications (Bulleted List)

• Model: DBDH 6 G1X/315 (Material No. R900458278 / R900387940)

• Valve Type: Direct Operated Seat-Type Pressure Relief Valve

• Nominal Size: NG6

• Set Pressure: 315 bar

• Maximum Operating Pressure: 315 bar

• Maximum Flow Rate: 50 L/min

• Connection Type: Threaded connection (G1/4″) or subplate mounting

• Sealing Material: NBR

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

• Adjustment Type: Bushing with hexagon and protective cap, hand wheel, rotary knob, or lockable rotary knob (optional)

• Component Series: 1X

• Weight: Approx. 0.4 kg

Key Technical Advantages

1. Precision Poppet/Ball Seat Sealing: The DBDH 6 G1X/315 employs a poppet with damping piston (315 bar pressure rating) for superior sealing performance with minimal leakage. The line-contact sealing between the poppet and seat ensures extremely low leakage in the closed position, maximizing volumetric efficiency.

2. Stepless Pressure Adjustment: System pressure can be set steplessly via the adjustment element. The gimbal-mounted adjustment element remains operable even under complete unloading conditions, preventing unintended loss of setting values.

3. Stroke Limitation Protection: Poppet stroke is precisely limited by embossing to prevent over-travel damage, ensuring long-term reliability and repeatable accuracy.

4. Flexible Mounting Options: Supports screw-in cartridge, threaded connection, or subplate mounting configurations, accommodating diverse hydraulic system integration requirements. The NG6 compact design is ideal for space-constrained applications.

Application Areas

• Injection molding machine hydraulic system pressure limiting

• Machine tool hydraulic power unit overload protection

• Construction machinery hydraulic circuit pressure control

• Industrial equipment hydraulic system safety valve functions

Expert Maintenance Tips

• Verify system cleanliness meets ISO 4406 standard (recommended 20/18/15 or cleaner) prior to installation

• Rotate the adjustment element slowly when setting pressure to avoid sudden loading that may cause spring fatigue

• Regularly inspect seals (NBR material), especially when using HFC fire-resistant hydraulic fluids

• If unable to achieve minimum set pressure, fully retract the adjustment element and re-screw it in

Model 2: DBDS 6 K1X/200

Product Overview

The DBDS 6 K1X/200 is a direct-operated screw-in cartridge pressure relief valve from Bosch Rexroth. Utilizing a poppet seat design, this valve limits hydraulic system pressure to ensure safe operation within the designated pressure range. When the pressure in channel P exceeds the spring set value, the poppet lifts against the spring force, allowing fluid to flow from channel P to channel T. With a set pressure of 200 bar and a maximum operating pressure of 315 bar, the DBDS 6 K1X/200 offers compact construction, fast response, and easy installation—ideal for hydraulic system integration in space-constrained applications.

Technical Specifications (Bulleted List)

• Model: DBDS 6 K1X/200 (Material No. R900423724)

• Valve Type: Direct-Operated Screw-in Cartridge Relief Valve

• Nominal Size: NG6

• Set Pressure: 200 bar

• Maximum Operating Pressure: 315 bar (Body max. 400 bar)

• Maximum Flow Rate: 50 L/min (Up to 200 L/min in some versions)

• Connection Type: Screw-in Cartridge, G1/4″ ports

• Sealing Material: NBR

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

• Adjustment Type: Bushing with hexagon and protective cap

• Component Series: 1X

• Weight: 0.383 kg

Key Technical Advantages

1. Compact Cartridge Design: The DBDS 6 K1X/200 features an M28×1.5 standard cartridge cavity with NG6 compact dimensions, enabling easy integration into space-constrained hydraulic manifolds.

2. Poppet Seat Sealing Technology: The poppet seat design delivers line-contact sealing in the closed position with minimal leakage, meeting the pressure-holding requirements of precision hydraulic systems.

3. Broad Flow Adaptability: Maintains stable pressure-flow characteristics across varying flow conditions, suitable for variable-flow hydraulic systems.

4. Multiple Adjustment Options: Available with various adjustment types including bushing with hexagon and protective cap, rotary knob, hand wheel, or lockable rotary knob to accommodate different operational preferences and safety requirements.

Application Areas

• Mobile hydraulic equipment (excavators, loaders) pressure limiting

• Industrial hydraulic power unit overload protection

• Hydraulic fixture and tooling system pressure control

• Injection molding machine hydraulic circuit safety protection

Expert Maintenance Tips

• Verify cartridge cavity (M28×1.5) is clean and free of debris, with intact threads prior to installation

• Use a torque wrench to install per Rexroth specifications—avoid over-tightening that may damage the valve body or seals

• Regularly check for set pressure drift and recalibrate as needed

• Shorten seal inspection intervals when using HFC fire-resistant hydraulic fluids

Model 3: DBDS 10 K1X/315

Product Overview

The DBDS 10 K1X/315 is a direct-operated screw-in cartridge pressure relief valve from Bosch Rexroth. This normally closed, direct-acting poppet-type valve opens when system pressure exceeds the spring set value, allowing fluid to flow from channel P to channel T. With a set pressure of 315 bar and a body rating of 630 bar, the NG10 design accommodates medium-flow hydraulic system pressure control requirements. As a screw-in cartridge valve, the DBDS 10 K1X/315 delivers compact construction, fast response, and high reliability across industrial and mobile hydraulic applications.

Technical Specifications (Bulleted List)

• Model: DBDS 10 K1X/315 (Material No. R900424150)

• Valve Type: Direct-Operated Pressure Relief Valve (Screw-in Cartridge, Poppet Type)

• Nominal Size: NG10

• Set Pressure: 315 bar

• Maximum Operating Pressure: 630 bar (Body Rating)

• Maximum Flow Rate: ~120 L/min (Recommended); Peak Transient Up To 330 L/min

• Connection Type: Screw-in Cartridge, G1/2″ ports

• Sealing Material: NBR (Standard for mineral oil)

• Compatible Fluids: Mineral Oils (HL/HLP), HETG (Vegetable Oils), Biodegradable Fluids

• Adjustment Type: Hexagonal Bushing with Protective Cap (Standard)

• Operating Temperature: -20°C to +70°C (with NBR seals)

• Component Series: 1X

• Weight: Approx. 0.54 kg

Key Technical Advantages

1. High Pressure Rating: Body rated to 630 bar, significantly exceeding the 315 bar set pressure, providing ample safety margin for extreme operating conditions.

2. High Flow Capacity: Recommended flow of 120 L/min with peak transient capacity up to 330 L/min, suitable for high-flow hydraulic system pressure control.

3. Excellent Temperature Performance: NBR seals support operating temperatures from -20°C to +70°C, adapting to diverse industrial environments.

4. Eco-Friendly Compatibility: Compatible with HETG vegetable oils and biodegradable fluids in addition to mineral oils, meeting the requirements of increasingly environmentally conscious industries.

Application Areas

• Construction machinery hydraulic systems (excavators, cranes) pressure limiting

• Industrial hydraulic power unit overload protection

• Metallurgical equipment hydraulic system safety control

• Wind turbine hydraulic pitch system pressure protection

Expert Maintenance Tips

• Verify cartridge cavity (standard DBD NG10 cavity, typically M35×1.5 or M33×1.5) is clean prior to installation

• System fluid cleanliness should meet ISO 4406 20/18/15 or cleaner

• Consult Rexroth regarding seal compatibility when using biodegradable hydraulic fluids

• Regularly inspect set pressure, especially after significant system pressure fluctuations

Model 4: DBDS 30 K1X/315

Product Overview

The DBDS 30 K1X/315 is a direct-operated screw-in cartridge pressure relief valve from Bosch Rexroth. This normally closed, direct-acting poppet-type valve limits hydraulic system pressure to prevent overpressure conditions. When the pressure in channel P exceeds the spring set value, the poppet opens, allowing fluid to flow from channel P to channel T. With a set pressure of 315 bar and a maximum flow rate of 330 L/min, the NG30 large-size design meets the pressure control requirements of high-flow hydraulic systems. The DBDS 30 K1X/315 utilizes an M60×2 cartridge cavity for integration into high-flow hydraulic manifolds.

Technical Specifications (Bulleted List)

• Model: DBDS 30 K1X/315 (Material No. R900424288 / R900424283)

• Valve Type: Direct-Operated Screw-in Cartridge Relief Valve

• Nominal Size: NG30

• Set Pressure: 315 bar

• Maximum Operating Pressure: 315 bar

• Maximum Flow Rate: 330 L/min (302 L/min in some versions)

• Connection Type: Screw-in Cartridge, G1 1/2″ ports

• Sealing Material: FKM (NBR in some versions)

• Compatible Fluids: HL, HLP, HLPD, HVLP, HVLPD, HETG, HEES, HEPG, HFDU, HFDR

• Adjustment Type: Bushing with hexagon and protective cap, rotary knob, hand wheel, or lockable rotary knob

• Component Series: 1X

• Weight: 2.36 kg

Key Technical Advantages

1. High Flow Capacity: Maximum flow rate of 330 L/min makes this valve the ideal pressure control solution for high-flow hydraulic systems.

2. FKM High-Performance Sealing: FKM (fluorocarbon rubber) seals deliver excellent high-temperature resistance and chemical compatibility, accommodating a broader range of hydraulic fluids.

3. Broad Fluid Compatibility: Compatible with mineral oils, synthetic esters, biodegradable fluids, and more—adapting to diverse industrial applications.

4. Gimbal-Mounted Anti-Loss Adjustment: The gimbal-mounted adjustment element remains operable even under complete unloading conditions, preventing unintended loss of setting values.

Application Areas

• Large injection molding machine hydraulic system pressure control

• Forging equipment hydraulic system overload protection

• Marine hydraulic system safety valves

• Large industrial hydraulic power unit system pressure limiting

Expert Maintenance Tips

• Verify cartridge cavity (M60×2) specifications are correct and thoroughly clean prior to installation

• FKM seals offer excellent temperature resistance but avoid excessive compression during installation

• In high-flow applications, install an adequately sized filter upstream of the valve to ensure fluid cleanliness

• Perform regular pressure calibration to ensure accurate set values

Model 5: DBDS 10 P1X/315

Product Overview

The DBDS 10 P1X/315 is a direct-operated subplate-mounted pressure relief valve from Bosch Rexroth. Utilizing direct-acting poppet technology, this valve limits hydraulic system pressure. When system pressure exceeds the spring set value, the poppet opens, allowing fluid to flow from channel P to channel T. Unlike the “K” series (screw-in cartridge), the “P” series is specifically designed for subplate mounting. With a set pressure of 315 bar and a body rating of 630 bar, the NG10 subplate-mounting design makes this valve suitable for traditional hydraulic valve manifold integration, facilitating easy installation and maintenance.

Technical Specifications (Bulleted List)

• Model: DBDS 10 P1X/315 (Material No. R900424158)

• Valve Type: Direct-Operated Pressure Relief Valve, Subplate Mounting

• Nominal Size: NG10

• Set Pressure: 315 bar

• Maximum Operating Pressure: 630 bar (Body Rating)

• Maximum Flow Rate: 120 L/min (140 L/min in some versions)

• Connection Type: Subplate Mounting

• Sealing Material: NBR

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

• Adjustment Type: Bushing with hexagon and protective cap

• Component Series: 1X

• Weight: 3.681 kg

Key Technical Advantages

1. Subplate Mounting Design: The “P” series is specifically engineered for subplate mounting, facilitating easy integration into traditional hydraulic valve manifolds with simplified installation and maintenance.

2. High Pressure Rating: Body rated to 630 bar, providing ample safety margin for system protection.

3. Stable Flow-Pressure Characteristics: Maintains stable pressure control characteristics across the 120 L/min flow range, suitable for variable-flow hydraulic systems.

4. Mature Direct-Acting Poppet Technology: Leverages Bosch Rexroth’s proven direct-acting poppet technology for fast response, high repeatability, and long-term operational stability.

Application Areas

• Industrial hydraulic power unit pressure control and overload protection

• Machine tool hydraulic system pressure limiting

• Test bench hydraulic system safety protection

• Traditional subplate valve manifold hydraulic system integration

Expert Maintenance Tips

• Ensure the mounting surface is flat with surface roughness Ra ≤ 0.8 μm for proper sealing

• Tighten mounting bolts evenly to Rexroth specified torque (refer to RE 25715)

• Subplate mounting facilitates maintenance—inspect seal condition every 2,000 operating hours

• During initial system startup, gradually increase pressure to the set value and observe for any leakage