R901520296 4WRDE25V1-350L-6X/MXYWG/24A5 Pilot operated proportional solenoid directional valve from Rexroth

FAQ:

1. Spool Type (V1)

   The V1 spool​ is an offset spool​ with a specific center position configuration (P→B, A→T). It has a small overlap (1–11% stroke offset), which provides a defined flow path in the center position and is suitable for applications requiring specific fail-safe behavior or pre-defined center flow.

2. Control & Feedback (/A5)

   The /A5​ suffix indicates a ±10 V DC voltage input​ for the command signal. The valve also outputs a ±10 V DC actual value signal​ representing the main spool position, enabling full closed-loop control via an external motion or servo controller.

3. Pilot Oil Configuration (/MXYWG)

   • /M: Standard configuration uses internal pilot oil​ (taken from main P and returned to main T).

   • /XY: The valve is equipped with external pilot ports (X and Y). If the system requires it, you can disconnect the internal pilot and supply clean, filtered external pilot oil to the X port (25–315 bar) and use Y as an external drain (max backpressure typically < 10 bar).

4. High Dynamic Performance

   As part of the 4WRDE-6X series, this valve is designed for high dynamic applications​ (e.g., position, velocity, or pressure control loops). It offers fast step response (typically < 10 ms) and high frequency response (≥ 100 Hz at -3 dB) due to its 3-stage nozzle-flapper pilot design.

5. Critical Installation Notes

   • Pilot Supply:​ If using internal pilot (/M), ensure main P port pressure is within 25–315 bar. For higher precision or dirty oil conditions, switch to external pilot via X/Y ports.

   • Cleanliness:​ Maintain high oil cleanliness (recommended NAS 1638 Class 8 or ISO 4406 20/18/15) due to the sensitive nozzle-flapper pilot stage.

   • Drain Line:​ If using external drain (Y port), ensure it is connected directly to the tank with minimal backpressure.