R900927230 4WREE10E75-2X/G24K31/A1V German Rexroth original proportional valve

Key Differences & Selection Guide

1. Q: What is the core difference between 4WREE and 4WRAE series?

   A:​ The 4WREE series features LVDT feedback​ (closed-loop control), offering high precision and better contamination resistance. The 4WRAE series​ (e.g., R900954083) has no LVDT (open-loop), making it more cost-effective but with lower accuracy and repeatability.

2. Q: What is the control signal interface?

   A:​ The suffix /A1​ indicates a ±10 V DC​ analog voltage command input. For a 4–20 mA​ current signal, select the version with the /F1​ suffix.

3. Q: Is an external amplifier required?

   A:​ No.​ The "E" in the model and the /G24K31​ suffix indicate the valve has Integrated On-Board Electronics (OBE). It only requires a 24V DC power supply and the command signal to operate.

4. Q: What are the characteristics of the "E" spool?

   A:​ The E-type (zero overlap/critical center) spool​ provides good linearity around the center position, fast response, and is suitable for applications requiring precise flow control and rapid directional changes.

5. Q: What are the critical installation considerations?

   A:​ Ensure the tank (T) port return line pressure does not exceed 210 bar. Due to its closed-loop design, this valve requires clean hydraulic fluid (typically NAS 1638 Class 8 or ISO 4406 18/16/13 is recommended).