Description
Product Overview
The Bosch Rexroth DBDS 20 G1A/315 Pressure Relief Valve, material number R900424174, is a direct-operated hydraulic pressure relief valve designed to limit pressure in industrial hydraulic systems. It opens when the hydraulic pressure reaches the preset value, allowing fluid to flow from the pressure port to the return port and helping protect pumps, piping, actuators, and other hydraulic components from excessive pressure.
This valve belongs to the Rexroth DBD pressure relief valve family and features a nominal size 20 design, a G1 threaded connection, mechanical pressure adjustment, and a nominal pressure setting of 315 bar. Its compact, mechanically adjustable construction makes it suitable for hydraulic power units, industrial machinery, and hydraulic control systems.
The valve is intended for maintenance and replacement applications where the installed hydraulic circuit requires the matching pressure rating, port configuration, and material number.
Rexroth DBDS 20 G1A/315
Key Features
- Manufacturer: Bosch Rexroth
- Model: DBDS 20 G1A/315
- Material Number: R900424174
- Product Type: Direct-operated pressure relief valve
- Nominal Size: NG20
- Pressure Setting: 315 bar
- Connection: G1 pipe thread, according to ISO 228-1
- Adjustment: Mechanical adjustment with hexagon and protective cap
- Sealing Material: NBR
- Hydraulic Function: Pressure limitation and system protection
- Suitable for industrial hydraulic power and control systems
Technical Specifications
| Specification | Details |
|---|---|
| Brand | Bosch Rexroth |
| Model | DBDS 20 G1A/315 |
| Series | DBD Pressure Relief Valve |
| Product Name | Direct-Operated Pressure Relief Valve |
| Material Number | R900424174 |
| Official Type Code | DBDS 20 G1X/315 |
| Place of Manufacture / Origin | Not verified for the individual unit |
| Product Status | Confirm actual condition with seller |
| Nominal Size | 20 (NG20) |
| Pressure Rating | 315 bar |
| Maximum Operating Pressure | Up to 400 bar for the applicable valve configuration; confirm operating limits |
| Maximum Flow Rate | Approximately 235–250 L/min, depending on the published specification |
| Connection Type | G1 threaded connection, ISO 228-1 |
| Number of Ports | 2 |
| Hydraulic Function | P → T pressure relief |
| Pressure Adjustment | Mechanical |
| Adjustment Element | Hexagon with protective cap |
| Sealing Material | NBR |
| Compatible Hydraulic Fluids | Specified mineral hydraulic oils and selected compatible fluids; verify seal compatibility |
| Dimensions | Approx. 135 × 100 × 70 mm for the NG20 threaded version; confirm drawing |
| Weight | Approx. 6.8 kg |
| Country of Origin | Not independently verified |
| Discontinued | Not verified |
Typical Applications
- Industrial hydraulic power units
- Hydraulic pressure protection circuits
- Machine tools and manufacturing equipment
- Hydraulic presses and clamping systems
- Material-handling machinery
- Hydraulic actuator and cylinder systems
- Industrial machinery maintenance and replacement
Frequently Asked Questions
Q1: What is the function of the DBDS 20 pressure relief valve?
It limits hydraulic system pressure by opening a flow path from the pressure port to the return port when pressure reaches the set value.
Q2: What does the 315 designation mean?
It identifies the valve’s nominal pressure-setting range or rating of 315 bar. The actual opening pressure must be set and verified according to the application requirements.
Q3: What is the difference between DBDS 20 G1X/315 and DBDS 20 G1A/315?
The official material number R900424174 is identified in manufacturer-related catalogs as DBDS 20 G1X/315. The listing’s “G1A/315” designation should be checked against the actual nameplate to avoid ordering a mismatched variant.
Q4: Which hydraulic fluids can be used?
The valve is specified for compatible hydraulic fluids, including certain mineral-oil types. Fluid compatibility depends on the NBR seals, temperature, and operating conditions. Check the manufacturer’s hydraulic-fluid documentation before use.
Q5: Can this valve replace another NG20 relief valve?
Not automatically. The pressure rating, threaded connection, adjustment mechanism, flow capacity, sealing material, and pressure-flow characteristics must match the existing circuit.
Q6: What should be checked before installation?
Verify the complete material number, nameplate type code, connection dimensions, pressure setting, hydraulic-fluid compatibility, and return-line backpressure. Depressurize the hydraulic system before removing or installing the valve.
Related Bosch Rexroth Hydraulic Components
The following models and product families are related sourcing options. They are not guaranteed direct replacements for R900424174.
- DBDS 20 G1X/315 — Direct-operated pressure relief valve
- DBDS 10 G1X/315 — NG10 pressure relief valve
- DBDS 15 G1X/315 — NG15 pressure relief valve
- DBDS 25 G1X/315 — NG25 pressure relief valve
- DBDS 30 G1X/315 — NG30 pressure relief valve
- DBDS 20 G1X/200 — NG20 valve with a 200-bar pressure rating
- DBDS 20 G1X/100 — NG20 valve with a 100-bar pressure rating
- DBDS 20 G1X/400 — NG20 valve with a 400-bar pressure rating, subject to configuration availability
- DBDH Pressure Relief Valves — Ball-seat pressure relief valve family
- DBD Pressure Relief Valves — Direct-operated hydraulic pressure control
- Bosch Rexroth Hydraulic Power Units — Hydraulic power generation and supply
- Bosch Rexroth Directional Control Valves — Hydraulic flow direction control
- Bosch Rexroth Pressure Control Valves — Hydraulic pressure management
- Bosch Rexroth Check Valves — One-way hydraulic flow control
- Bosch Rexroth Hydraulic Accessories — Hydraulic fittings and installation components
Ordering Information
When requesting a quotation, specify Bosch Rexroth DBDS 20 G1X/315, material number R900424174 and provide photographs of the nameplate, adjustment mechanism, and threaded connection.
The supplied listing uses the designation “G1A/315,” while published catalogs identify this material number as “DBDS 20 G1X/315.” Confirm the exact type code and physical configuration before purchasing or installing the valve.
