Rexroth DBW 20 Series Hydraulic Pressure Relief Valve

Description

This is a pilot-operated pressure relief valve, model DBW 20 B2-52/315-6EW230N9K4 from Bosch Rexroth. It is designed to limit pressure in hydraulic systems, thereby protecting components from overpressure. This valve features an integrated solenoid for electrical unloading of the pressure circuit. It is built for subplate mounting according to ISO 6264 standards, ensuring interchangeability and ease of installation.

Specifications

• Manufacturer: Rexroth
• Type: DBW 20 B2-52/315-6EW230N9K4
• Part Number (MNR): R900911748
• Valve Type: Pilot-operated pressure relief valve
• Size: 20 (NG20)
• Maximum Pressure Setting: 315 bar
• Solenoid Voltage: 230V AC, 50/60 Hz
• Mounting Interface: ISO 6264-AR-08-2-A

Label Info

• MNR: R900911748
• FD: 21010
• Serial: 000123559458

Application

This valve is widely used in general industrial machinery, presses, injection molding machines, and any hydraulic system requiring reliable pressure limitation and the ability for electrical unloading or pressure switching.

Country of Origin

Made in Germany.

CO2 Impact

Opting for this component saves approximately 37 kg of CO2 compared to manufacturing a new one. This choice supports sustainable industrial practices by reducing waste and energy consumption.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

The solenoid allows for electrical unloading of the pressure circuit. When energized, it connects the pilot stage to the tank, causing the main valve to open and relieve system pressure to a minimum value, which is useful for starting pumps under no load or for safety functions.

Bosch Rexroth generally recommends mineral oil-based hydraulic fluids (HL, HLP) according to DIN 51524. For optimal performance and longevity, a fluid cleanliness of at least ISO 4406 class 20/18/15 is recommended.

Yes, the pressure setting is adjustable up to the maximum of 315 bar. Adjustment is made via a screw, usually located under a protective cap. Turning the adjustment screw clockwise increases the pressure setting. Always consult the product datasheet and ensure the system is depressurized before making any adjustments.

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Last Update: Friday, March 13, 2026