REXROTH R900453821 Hydraulic Pressure Relief Valve Bar DB5F2-31/315U L/min

( Brand: Rexroth ), ( Manufacturer Part Number: R900453821 ), ( Part Type: Hydraulic Pressure Valve Bar Min ), ( Valve Operation: Manual ), ( Country Of Origin: Germany )

Review REXROTH Db5f2-31/315u Hydraulic Pressure Relief Valve 315 Bar L/min

The **Bosch Rexroth R900453821 DB5F-31/315U** is a high-performance hydraulic pressure relief valve engineered for demanding industrial applications where precision, reliability, and durability are paramount. Part of Rexroth s renowned **DB5F series**, this valve is specifically designed to protect hydraulic systems from excessive pressure buildup, ensuring optimal performance and longevity of connected components. With a robust **315-bar (4575 psi) pressure rating**, it excels in heavy-duty environments such as mobile machinery, construction equipment, mining operations, and industrial presses, where hydraulic systems operate under extreme loads and fluctuating conditions. The valve s **2000 liters per minute (l/min) flow capacity** allows it to handle substantial fluid volumes efficiently, making it suitable for large-scale hydraulic circuits where rapid pressure regulation is critical.

Constructed from premium materials, the **DB5F-31/315U** features a **direct-acting pilot valve mechanism**, which ensures quick and responsive pressure relief without the need for external pilot pressure. This design minimizes system lag, reducing the risk of pressure spikes that could damage hydraulic actuators, pumps, or other sensitive components. The valve s **adjustable pressure setting** allows for precise calibration to match specific application requirements, providing flexibility in system design while maintaining safety margins. Its **compact yet robust housing** is engineered for easy integration into hydraulic manifolds or direct line installations, with standard **M24 x 1.5 thread connections** ensuring secure and leak-free performance.

One of the standout features of this relief valve is its **fail-safe design**, which guarantees that in the event of a system failure or pilot pressure loss, the valve will default to a closed position, preventing catastrophic pressure surges. This redundancy is particularly valuable in critical applications where system integrity cannot be compromised. Additionally, the **DB5F series** incorporates Rexroth s advanced **sealing technology**, utilizing high-quality elastomers and metal-to-metal interfaces to resist wear, corrosion, and contamination key factors in extending the valve s operational lifespan in harsh environments. The valve s **low internal leakage** further enhances efficiency by minimizing energy loss and maintaining system stability under varying loads.

For maintenance and serviceability, the **R900453821** is designed with accessibility in mind. Its modular construction allows for straightforward disassembly and reassembly, enabling technicians to perform routine inspections, adjust settings, or replace worn components without extensive downtime. The valve s **durable pilot assembly** and **precise spring calibration** ensure consistent performance over thousands of operating cycles, reducing the frequency of maintenance interventions. When paired with Rexroth s complementary hydraulic components such as pumps, filters, and control valves the **DB5F-31/315U** delivers a seamless and high-efficiency hydraulic solution, reinforcing the reliability of the entire system.

Ideal for applications requiring **high-pressure stability, rapid response, and long-term durability**, the **Bosch Rexroth R900453821 DB5F-31/315U** is a cornerstone component for engineers and operators seeking to optimize hydraulic system performance in the most demanding industrial settings. Whether deployed in **excavators, hydraulic presses, offshore rigs, or heavy-duty material handling equipment**, this valve ensures that pressure is always contained within safe limits, safeguarding both equipment and personnel while maximizing operational efficiency.

### **Pros and Cons of buying a Rexroth R900453821 DB5F-31/315U Hydraulic Pressure Relief Valve (315 bar, 2000 L/min)**

1. **High Pressure and Flow Capacity** The valve is rated for **315 bar (4575 psi)** and **2000 L/min**, making it suitable for heavy-duty industrial applications, including presses, injection molding machines, and large hydraulic systems. This ensures reliable performance in demanding environments.

2. **Reliable Brand Reputation** Rexroth (Bosch Group) is a well-established manufacturer in hydraulic components, known for durability, precision engineering, and long-term reliability. Original equipment (OEM) parts like this are often preferred over aftermarket alternatives.

3. **Precision Engineering and Quality** The valve is designed with tight tolerances, ensuring consistent pressure regulation and minimal leakage. This reduces system inefficiencies and extends the lifespan of connected components.

4. **Compatibility with Advanced Systems** The **DB5F** series is part of Rexroth s modular hydraulic valve range, which integrates well with modern control systems, including electronic pressure control (EPC) and proportional valves, allowing for advanced automation.

5. **Long Service Life** High-quality materials and robust construction mean this valve can withstand prolonged use in harsh conditions, reducing the need for frequent replacements.

6. **Widely Available Support** As an OEM part, it benefits from extensive technical documentation, spare parts availability, and after-sales service from authorized distributors and service centers.

7. **Adjustable Pressure Setting** The valve allows for fine-tuning of pressure limits, making it adaptable to different system requirements without needing multiple valve types.

8. **Compatibility with Rexroth Hydraulic Systems** If your system already uses Rexroth components, this valve will integrate seamlessly, maintaining consistent performance and reducing compatibility issues.

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1. **High Cost** Being an OEM part from a reputable brand, this valve is significantly more expensive than generic or aftermarket alternatives. The price may be a barrier for smaller businesses or budget-conscious buyers.

2. **Potential Overkill for Light-Duty Applications** If the system rarely operates at **315 bar** or **2000 L/min**, the valve s high capacity may be unnecessary, leading to wasted investment. A lower-rated valve could suffice for less demanding tasks.

3. **Complex Installation and Calibration** High-performance valves like this require proper installation, alignment, and calibration to function correctly. Improper setup can lead to premature failure or system inefficiencies. Professional assistance may be needed, adding to costs.

4. **Limited Customization** Unlike some aftermarket valves, OEM parts may not offer as many customization options (e.g., different mounting styles, additional ports, or special coatings). This could restrict flexibility in certain applications.

5. **Longer Lead Times** Due to its specialized nature, ordering may take longer than generic valves, which could disrupt project timelines in urgent situations.

6. **Maintenance Requirements** While durable, high-performance valves still require regular maintenance (e.g., filter changes, leak checks, and pressure adjustments) to ensure optimal performance. Neglecting maintenance can lead to reduced lifespan.

7. **Potential for Counterfeit Parts** Since Rexroth is a premium brand, there is a risk of purchasing counterfeit or low-quality replicas, which may fail prematurely. Buying from authorized distributors is crucial to avoid this.

8. **Higher Energy Consumption** A valve rated for **315 bar** will consume more power than a lower-rated one, which may impact operational costs in energy-sensitive applications.

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The **Rexroth R900453821 DB5F-31/315U hydraulic pressure relief valve** is an excellent choice for **high-pressure, high-flow industrial applications** where reliability, precision, and longevity are critical. Its superior engineering, compatibility with advanced hydraulic systems, and brand-backed support make it a strong investment for large-scale or mission-critical operations.

However, for **smaller systems, low-pressure applications, or cost-sensitive projects**, the high price and over-engineered specifications may not justify the purchase. In such cases, a lower-rated or aftermarket valve could be a more economical alternative without sacrificing performance.

- Your system requires **315 bar or higher** and **2000 L/min flow**.

- You are working with **Rexroth hydraulic systems** or need OEM compatibility.

- Reliability and long-term durability are priorities (e.g., in manufacturing, heavy machinery, or critical automation).

- You have the budget and can justify the investment based on system demands.

- Your application operates at **lower pressures or flows** (e.g.,

- You are on a tight budget and can find a **high-quality aftermarket or compatible valve** with similar performance.

- The system is **non-critical**, and downtime risks are low, allowing for more frequent valve replacements if needed.

- **Verify compatibility** with your existing hydraulic system (line sizes, mounting, and control requirements).

- **Purchase from authorized distributors** to avoid counterfeit parts.

- **Consult a hydraulic specialist** if unsure about sizing or installation to prevent system inefficiencies.

- **Factor in maintenance costs** ensure your team or service provider can properly maintain the valve.

Ultimately, this valve is a **premium choice for high-end applications** but may not be the most cost-effective solution for simpler or lower-demand systems. Always align the purchase with your specific operational needs.

Details:

Items with free shipping are not to return unless there was an error on our part or a defect in the item. USPS picks up at 9am daily and UPS noon Mon-Thurs 10am on Fri. Switching Positions MN: R900453821.

Model - DB5F2-31/315U. Rexroth Hydraulic Pressure Relief Valve Mechanically Actuated.

part #: r900453821 prices

• $383.90-$1439.99

specifications valvesplumbing:

• brand: Rexroth
• mpn: R900453821
• part type: Hydraulic Pressure Valve Bar Min
• valve operation: Manual
• country of origin: Germany

general valvesplumbing:

• Hydraulics, Pneumatics, Pumps Plumbing > Valves Manifolds > Other Valves Manifolds
• condition: Used

returns valvesplumbing:

• method: Money back
• paid by: Buyer
• policy: Returns Accepted
• time: 30 Days

seller valvesplumbing:

• rating: 99.9%
• city: Camden, New Jersey
• # reviews: 67646

offer valvesplumbing:

• options: Ship-to-home
• best offers: True
• quantity: 1
• availability: In Stock
• sold: 0
• started: February 17, 2026

shipping valvesplumbing:

• carrier: UPS
• service: UPS Ground, UPS Next Day Air Saver
• type: Calculated
• cost: $73.67
• transit: 2-6 Days
• class: Standard, One-day

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