The DRE and ZDRE pilot-operated proportional pressure limiting valves, nominal size 6, 1X series, operate up to 210 bar and a flow rate of 30 L/min. They offer proportional solenoid actuation, mounting on a plate with a DIN 24 340 hole configuration, Form A6, and adjustable electronic control. They ensure low dispersion in pressure curves and an adjustable minimum pressure of 2 bar, with options for analog and digital amplifiers.