DB / DBW -Pilot Operated Pressure Relief Valve
The Bosch Rexroth DB and DBW series are heavy-duty, pilot-operated pressure relief valves designed for high-pressure, high-flow hydraulic systems. They serve as critical safety and control components, protecting hydraulic circuits from over-pressurization and enabling automated system unloading.
- Operating Pressure : High Performance Range
- Application : Industrial & Mobile Systems
About this item
The Bosch Rexroth DB and DBW series are high-performance, pilot-operated pressure relief valves used to limit (DB) or limit and electrically unload (DBW) operating pressure in heavy-duty hydraulic systems
| Parameter / Attribute | Specification / Feature Detail |
|---|---|
| Primary Function | System pressure limitation (DB) and optional electrical unloading (DBW). |
| Maximum Operating Pressure | Up to 350 bar (5076 PSI). |
| Maximum Flow Rate | Up to 650 L/min (171 GPM). |
| Nominal Sizes (NG) | Available in sizes 10, 25, and 32. |
| Mounting Types | Subplate mounting (ISO 6264 compliant) or threaded connection. |
| Adjustment Options | Hexagon screw with protective cap, rotary knob, or lockable scale knob. |
| Integrated Unloading (DBW) | Top-mounted directional valve allows automated, zero-load pump startups. |
| Solenoid Fail-Safe Modes | Choice of Normally Open (NO) or Normally Closed (NC) during power loss. |
| Fluid Compatibility | Optimized for mineral oils and HL/HLP hydraulic fluids. |
| Fluid Cleanliness Class | Requires a minimum cleanliness level of ISO 4406 20/18/15. |
| Seal Options | Available in NBR (standard nitrile) or FKM (Viton) for high temperatures. |
| Pilot Oil Configuration | Internal or external pilot oil supply and drain options available. |
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