R900519544 Bosch Rexroth Pressure reducing valve

Pressure valves type DR 10 K.. are pilot-operated pressure reducing valves for block design installation. They are used for reducing a system pressure. The secondary pressure is set via the adjustment type (4). In initial position, the valves are open. Hydraulic fluid can flow from main port 2 to 1 without restrictions. The pressure in main port 1 acts simultaneously at main spool (1) and via the nozzle (2) at the spring-loaded inside of the main spool (1). Similarly, it acts via nozzle (7) on the pilot poppet (8). If the pressure in main port 1 exceeds the value set at spring (5), the pilot poppet (8) opens. Hydraulic fluid flows from the chamber of spring (3) via the nozzle (7), the pilot poppet (8) and the spring chamber (6) into main port 3. The main spool (1) assumes its control position and keeps the value in main port 1 set at the spring (5) constant. The pilot oil return from the spring chamber (6) is always realized externally via main port (3). Notice! Counter pressures (main port 3) add up to the set pressure. Type DR 10 K5-3X/.YM