R900949806 4WREE10W50-2X/G24K31/F1V Rexroth original proportional hydraulic valve

Key Differences & Selection Guide

1. Q: What is the difference between the "W" and "E" spools?

   A:​ The W spool (overlap)​ has a small dead zone at the center, providing smooth starts/stops and preventing actuator creep. The E spool (zero overlap)​ offers a more direct, linear response and is better for precise flow control.

2. Q: Why choose the /F1 version over /A1?

   A:​ The /F1​ suffix indicates a 4–20 mA current input, which is more resistant to electrical noise over long cable runs compared to the /A1​ version (±10V voltage input). This makes it suitable for industrial environments with significant EMI.

3. Q: Does this valve require an external amplifier?

   A:​ No.​ The "E" in 4WREE and the /G24K31​ suffix confirm Integrated On-Board Electronics (OBE). It operates directly with a 24V DC power supply and the 4–20 mA command signal.

4. Q: Is this valve suitable for closed-loop speed control?

   A:​ Yes.​ As part of the 4WREE series, it features LVDT feedback​ that provides internal closed-loop control of the spool position, ensuring high repeatability and accuracy in speed control applications.

5. Q: What is the critical installation note?

   A:​ Maintain the T-port backpressure below 210 bar. Due to the precision spool and LVDT, ensure high oil cleanliness (recommended NAS 1638 Class 8 or better) to prevent damage to the tight tolerances.