FAQ: Rexroth ZDB10VP2-4X/315V

What is it?​

A stacked, solenoid-controlled high-flow relief/unloading valve with a two-stage pilot (VP2).

Key specs?​

• Type:​ Stacked relief/unloading valve.

• Pressure:​ 315 bar.

• Flow:​ 100 L/min.

• Pilot:​ VP2 (two-stage).

• Voltage:​ 24V DC.

How does it work?​

The solenoid controls the pilot stage. When energized, the main valve opens to unload pump flow to tank. De-energizing it resets the pressure to 315 bar.

What is VP2?​

A two-stage pilot design that provides more stable control and faster response at high flows and pressures compared to single-stage pilots.

Where is it used?​

In high-power hydraulic systems (e.g., presses, injection molding machines) for energy-saving pump unloading and pressure control.

Common issues?​

• Fails to unload:​ Check solenoid and power.

• Pressure instability:​ Check pilot supply pressure and fluid contamination.

• Noise:​ Ensure stable pilot pressure and no air in the system.