Rexroth ressure valve type DBW is a pilot-operated pressure relief valve. It is used for limiting the operating pressure. The pressure relief valves DBW basically consist of the main valve with main spool insert and pilot control valve with pressure adjustment element. The function of Rexroth DBW is basically the same as that of valve type DB. The unloading of the main spool is, however, achieved by controlling the mounted directional spool valve.

Function of Rexroth DBW Pilot-Operated Pressure Relief Valve:

Rexroth DBW pilot-operated pressure relief valve provides precise pressure limiting and fast electromagnetic unloading. During normal operation, it acts as a reliable safety valve, opening smoothly when system pressure approaches the set value to protect pumps, cylinders, and pipelines from overload. When the solenoid coil is energized, the integrated pilot directional valve instantly switches the pilot circuit, fully opening the main stage and quickly reducing system pressure to nearly zero, enabling energy-saving standby. With its mature pilot-operated design, the Rexroth DBW valve ensures stable and responsive pressure regulation even under high pressure and large flow, making it ideal for applications requiring frequent pressure changeovers, rapid unloading, or improved energy efficiency in industrial and mobile hydraulic systems.

Advantages of Rexroth DBW Pilot-Operated Pressure Relief Valve:

The Rexroth DBW series is well-recognized for its reliable pilot design and integrated solenoid unloading capability. Key advantages include:

1. Stable Pressure Control

Rexroth DBW features a pilot-operated design, with the main valve controlled by a pilot oil circuit. This ensures smooth pressure regulation without sudden jumps or oscillations, maintaining stable output even under high pressure or fluctuating flow conditions.

2. Fast Electromagnetic Unloading

Rexroth DBW integrates a small solenoid directional valve in the valve body that directly switches the pilot oil circuit, allowing the main valve to quickly switch to the unloading state and rapidly reduce system pressure. It is ideal for systems with frequent start/stop cycles or energy-saving standby.

3. Smooth Switching with Low Pressure Shock

Rexroth DBW features optimized internal flow paths and damping design, ensuring smooth switching with minimal pressure shocks, protecting system components and extending equipment life.

4. Integrated, Highly Reliable Structure

Rexroth DBW combines relief and solenoid unloading functions within a single valve body, reducing external piping, fittings, and additional components, and fundamentally lowering the risk of leakage, installation errors, and system failures.

Applications of Rexroth DBW Pilot-Operated Pressure Relief Valve

The Rexroth DBW series is suitable for hydraulic systems requiring stable pressure control, fast unloading, and energy-saving standby. Typical applications include:

1. Industrial Hydraulic Systems

Rexroth DBW can be used in pumps, hydraulic cylinders, pipelines, and other systems to provide pressure limiting and overload protection, while supporting remote unloading and multi-stage pressure control—suitable for various industrial hydraulic circuits.

2. Automated Production Lines & Machinery

Rexroth DBW is ideal for hydraulic systems in machine tools, injection molding machines, die-casting machines, presses, and other industrial equipment, offering stable pressure control and fast response to ensure safe and reliable operation.

3. Construction & Mobile Machinery

Rexroth DBW ensures stable pressure for critical functions in cranes, excavators, and agricultural machinery, even under vibration and complex working conditions.

4. Special Operating Conditions & High-Pressure Protection

Rexroth DBW is suitable for hydraulic test benches, marine deck machinery, and other high-pressure or specialized environments, providing reliable pressure limiting and unloading to protect equipment safety.

FAQ

Q1: What is the difference between Rexroth DBW and DB?

The Rexroth DB is a standard pilot-operated relief valve providing only pressure-limiting functionality; it requires manual or external pilot control. The Rexroth DBW adds an integrated solenoid directional valve, enabling fast unloading through electrical signals. This allows systems to switch between high-pressure operation and low-pressure standby, making DBW ideal for energy-efficient and dynamic hydraulic systems.

Q2: What is the weight of Rexroth DBW valves?

Weights for the Rexroth DBW Series 5X (from the official data sheet) are listed below:

Size(NG)	Code	Weight(kg)
10	DBW10...	4.05
	DBW10...G...	6.75
16	DBW15...G...	6.65
25	DBW20...	4.95
	DBW20...G...	6.55
	DBW25...G...	6.45
32	DBW30...	5.85
32	DBW30...G...	6.25

Q3: What is the difference between Rexroth DBW (pilot-operated) and Rexroth DBD (direct-acting)?

The Rexroth DBW is a pilot-operated valve—suitable for high pressure and large flow, with stable pressure regulation and the ability to perform electromagnetic unloading (exclusive to DBW).

The Rexroth DBD is direct-acting, using a spring-loaded poppet for immediate response. It is simple and compact but offers lower flow capacity and cannot perform remote unloading.

In short: DBW for large systems and electrical unloading; DBD for small circuits and basic safety pressure relief.

Q4: Can you provide Certificate of Origin (COO) of Rexroth DBW?

COO can be provided upon request, subject to actual conditions and additional costs.

Q5: Does Rexroth DBW come with a test report or certificate?

Certain test reports/certificates are available upon request at quotation or order stage, with extra cost.

Q6: Can you provide EUR.1 Certificate?

Yes. Applicable for imports from countries with EU trade agreements (mainly Central/Eastern Europe & Middle East) , with a fee of €160 per certificate.

Q7: Can you provide CAN Certificate?

This is an EU–Korea FTA certificate. For goods under €6000 originating in EU, entry into Korea usually does not require CAN certificate. We generally do not provide this certificate.

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Download：

Data Sheet of DBW Series