R901401731 4WRLE25V370M-4X/MXY/24A1 Rexroth proportional solenoid directional valve

FAQ:

1. Spool Type (V)

   The V spool​ is an offset spool​ with a specific center position configuration (typically 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 (/A1)

   The /A1​ suffix indicates a ±10 V DC voltage input​ for the command signal. The valve features integrated LVDT position feedback, enabling full closed-loop control via an external motion or servo controller.

3. Pilot Oil Configuration (/MXY)

   This valve uses external pilot oil supply (X port) and external pilot oil return (Y port). You must provide clean, filtered pilot oil to the X port (25–315 bar) and ensure the Y port drains directly to the tank with minimal backpressure (max 10 bar). The /M​ indicates NBR seals.

4. High Dynamic Performance

   As part of the 4WRLE series, this valve is designed for high dynamic applications​ (e.g., position, velocity, or pressure control loops). It offers fast step response and high frequency response due to its pilot-operated design with integrated electronics.

5. Critical Installation Notes

   • Drain Line:​ The external pilot drain (Y port) must be connected directly to the tank with a dedicated line. Backpressure on Y must be kept low (< 10 bar).

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

   • Pilot Supply:​ Provide clean, regulated pilot pressure to the X port.