FAQ: Rexroth ZDBY6DA2-1X/80V/60

What is it?​

A pilot-operated, solenoid-controlled relief cartridge valve. It acts as a remote-controlled unloading valve.

Key features?​

• Type:​ Pilot-operated relief valve.

• Control:​ Electrically operated (solenoid, 24V DC).

• Function:​ Can remotely unload the system or set pressure.

• Set pressure:​ 80 bar.

• Max flow:​ 60 L/min.

How does it work?​

The valve is normally closed. When the solenoid is energized, it opens the pilot stage, which vents the main valve's control pressure, causing the system to unload to tank at low pressure. De-energizing it resets the pressure to the set value (80 bar).

Where is it used?​

Primarily as an electrically controlled unloading valve​ in hydraulic systems, e.g., to unload the pump when the system is idle to save energy.

How is it installed?​

It is a cartridge/plate-mounted valve​ installed into a machined cavity in a valve block or manifold. The external pilot supply (X)​ and drain (Y)​ must be connected correctly.

Wiring notes?​

Requires a 24V DC power supply connected to its solenoid coil. Ensure correct polarity and use appropriate protection (e.g., fuse, diode).

What is the "DA2" in the model?​

It refers to a 2-way pilot spool design, a common type for this unloading function.

Common issues?​

• Valve fails to unload: Check solenoid power/coil.

• System pressure low/erratic: Check pilot supply pressure or contamination.

• Excessive noise: Check for air in fluid or low pilot pressure.