R900765378 4WRZE16E1-150-7X/6EG24N9K31/A1M Proportional directional valve Rexroth

Key Differences & Selection Guide

1. Q: What is the main difference between 4WRZE16E1 and the previous 4WRZE16E?

   A:​ The E1-spool​ includes an LVDT (Linear Variable Differential Transformer)​ for closed-loop spool position feedback. This provides higher control accuracy and repeatability compared to the open-loop E-spool version. The "1" in E1 specifically denotes the presence of this feedback sensor.

2. Q: What does the /M suffix mean?

   A:​ The /M​ suffix indicates standard NBR seals​ and the absence of an integrated pressure reducing valve (/D3). This valve does not have the built-in ZDR 6 pilot pressure regulator found in the D3 versions you inquired about earlier.

3. Q: How does the pilot oil configuration differ?

   A:​ This valve (/6EG24N9K31) requires external pilot oil supply (X port) and external drain (Y port). This is different from valves with "T" in the code (e.g., N9ETK31), which use internal drain. Ensure your hydraulic system provides a clean, regulated pilot pressure source to the X port.

4. Q: Why choose this valve?

   A:​ This model is ideal for high-flow applications (up to 460 L/min) requiring high precision. The combination of NG16 size, E1 closed-loop spool, and external pilot oil​ makes it suitable for large industrial machinery, presses, or test stands where control accuracy is critical.

5. Q: What is the critical installation note?

   A:​ Since this valve uses external pilot oil (X) and external drain (Y), you must connect the Y port directly to the tank with minimal backpressure (max 30 bar). The main T-port backpressure must be below 210 bar. Maintain high oil cleanliness (recommended NAS 1638 Class 8 or better for the main stage).