FAQ: Rexroth 3DREP6C-2X/25EG24N9K4/M

What is this valve?​

It is a direct-operated, 3-way proportional pressure reducing valve. It converts an electrical input signal into a precisely controlled, reduced hydraulic pressure for ports A or B.

What are its key features?​

• 3-Way Function:​ Can reduce pressure (P→A/B) or relieve pressure (A/B→T) based on the solenoid actuation.

• External Electronics:​ Requires an external amplifier card (e.g., VT-VSPA1) for operation, offering flexibility in control system design.

• Manual Override:​ Includes a concealed manual override (N9) for testing or emergency operation without electrical power.

• Compact Size:​ NG6 size is ideal for low to medium flow pilot circuits.

How does it work?​

The electrical command signal (processed by an external amplifier) controls the solenoid force. This force sets the reduced outlet pressure proportionally. When de-energized, the valve center position connects the outlet ports (A, B) to the tank (T) for safe pressure release.

Where is it typically used?​

Commonly used in low-pressure pilot circuits, clamping applications, and secondary circuit pressure regulation where precise, variable control is needed (e.g., machine tools, test stands).

How do I wire it?​

• Valve:​ Connect the coil to the 3-pole connector (2 + PE).

• Control:​ Connect an external proportional amplifier to the valve coil. The amplifier must be supplied with 24V DC and receive a command signal (e.g., ±10V).

What if the pressure is unstable or incorrect?​

• Verify the external amplifier is correctly configured and powered.

• Check for contamination, as the small orifices in direct-acting valves are highly sensitive to dirt.

• Ensure the inlet pressure (P) is stable and significantly higher than the desired reduced pressure.

• Confirm the tank line (T) is not blocked and has low backpressure.