Bosch Rexroth | DB3U20D2-5X315U6EW110N9K412
DB3U20D2-5X/315U6EW110N9K4/12
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The DB3U20D2-5X/315U6EW110N9K4/12 relief valve is produced by Bosch Rexroth for the DB Pressure Relief Valves series and limits excess pressure in hydraulic automation loops. It attaches through subplate mounting and follows the ISO 6264 porting pattern, providing straightforward integration on manifold plates. Nominal size 25 passages permit a maximum flow of 500 l/min. The assembly is rated for 350 bar at ports P and X, 315 bar at port T, and 160 bar at ports Y and t, with an overall pressure rating of 315 bar for most circuits. Fluid paths remain stable across a viscosity range of 10 to 800 mm²/s, allowing the valve to function with a wide selection of mineral oils.
The unit incorporates a 6E NG6 directional insert and an electrical connector that matches EN 175301-803 code K4, enabling standard solenoid wiring on the manifold block. A concealed manual override designated N9 lets maintenance personnel actuate the cartridge without energizing the coil. The hydraulic medium must meet cleanliness class ISO 4406 (c) 20/18/15 to avoid seat damage, and fluid temperatures can vary from −20 to +80 °C without affecting pressure response. Correct installation calls for 185 Nm torque on size 25 mounting screws to secure the body against block distortion. These characteristics complete the technical parameters needed for repeatable pressure relief in industrial hydraulic systems.
Technical Specifications
Cleanliness Class
ISO 4406 (c) 20/18/15
Directional Valve Type
6E (NG6)
Electrical Connection
EN 175301-803 (K4)
Hydraulic Fluid Temp Range (nbr)
-20 to +80 °C
Manual Override
Concealed (N9)
Max Operating Pressure (port P, X)
350 bar
Max Operating Pressure (port T)
315 bar
Max Operating Pressure (ports Y,t, 6ew)
160 bar
Maximum Flow (subplate)
500 l/min
Mounting Screw Torque (size 25)
185 Nm
Nominal Size
25
Porting Pattern
ISO 6264
Pressure Rating
315 bar
Type Of Connection
Subplate Mounting
Viscosity Range
10 to 800 mm²/s
1620 Old Apex Road
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