Bosch Rexroth DB20-1-5X/100X pilot-operated pressure-relief valve

DB20-1-5X/100X is a pilot-operated pressure-relief valve, published as factory article R901044543. This nominal size 25 subplate execution has NBR seals and rotary knob adjustment. Pilot-oil supply is external and pilot-oil return is internal, which are separate hydraulic functions. The pressure adjustment extends up to 100 bar; that endpoint is not a factory-set pressure.

Use the applicable manufacturer installation, fluid-compatibility and characteristic-curve conditions. Operating ceilings and pressure adjustment stages serve different purposes and must not be treated as a single simultaneous operating point.

Minimum attainable pressure depends on flow. With internal pilot return, pressure in the T line adds to the attained inlet pressure. Follow the appropriate pilot connections and pressure/flow curves when selecting the operating point.