Rexroth Pressure Relief Valve DBDS

The Rexroth DBD series is a line of direct operated seat-type pressure relief valves designed for system pressure limiting in hydraulic circuits. Available in screw-in cartridge, threaded connection and subplate mounting configurations, it covers nominal sizes 6 through 30 with pressure ratings up to 630 bar, making it suitable for a wide range of low to high-pressure hydraulic applications.

This valve series uses a hardened poppet (DBDS variant, up to 400 bar) or ball (DBDH variant, size 10 only, up to 630 bar) as the closing element, paired with graded spring sets for stepless pressure adjustment. The seat valve structure ensures tight shut-off and low leakage, while the direct operated design delivers fast response to pressure spikes, effectively protecting hydraulic pumps, actuators and circuit components from overpressure damage.

The DBD series serves as a versatile pressure control solution for industrial hydraulic systems, delivering reliable pressure limiting, overpressure protection and stable pressure regulation.

• Hydraulic Power Units – Serves as primary or secondary relief valve on standard and custom hydraulic power packs. The direct-acting structure responds rapidly to pressure spikes from load switching and valve actuation, effectively protecting pumps, filters and circuit components from overpressure damage.
• Machine Tool & Fixtures – Applied in clamping circuits and fixture hydraulics for machine tools. The seat valve design delivers low-leakage performance, maintaining stable clamping force over long holding periods to prevent workpiece displacement and support consistent machining precision.
• Lubrication & Control Oil Systems – Widely used in lubrication stations, pilot control oil circuits and small hydraulic power units for pressure limiting and overpressure protection, with a compact structure suitable for integrated manifold design.
• Press & Forming Safety Circuits – The PED-certified safety valve variant acts as a secondary safety overflow backup in stamping presses, bending machines and die casting equipment. It opens reliably at set pressure to limit system peak values, complying with industrial safety specifications.
• Test Rigs & Calibration Systems – With graded spring pressure stages and fine adjustment capability, it suits material testing machines, hydraulic calibration benches and laboratory test systems. Its stable overflow characteristics support accurate pressure setting and reliable test data acquisition.