R901188943 4WRZE16E-150-7X/6EG24N9EK31/A1D3M Proportional directional valve from Rexroth, Germany

Key Differences & Selection Guide

1. Q: What is the main difference between this valve (NG16) and the previous NG10 valves?

   A:​ This is a larger size (NG16)​ valve designed for higher flow rates​ (rated 150 L/min, max ~460 L/min). It uses a CETOP 7 (ISO 4401-07)​ mounting subplate and has significantly larger port sizes compared to the NG10 (CETOP 5) valves you inquired about earlier.

2. Q: What does the "E-spool" mean?

   A:​ The E-spool​ is a zero-overlap spool​ (similar to a servo spool). It provides high linearity and is used in applications requiring precise speed control without the "dead zone" characteristic of overlap spools (W/W1).

3. Q: What is the purpose of the /D3 suffix?

   A:​ The /D3​ suffix indicates that the valve is equipped with an integrated pressure reducing valve (ZDR 6). This valve regulates the pilot pressure supplied to the main stage, which can be used to limit the maximum force or speed of the actuator for safety or control purposes.

4. Q: Does this valve have LVDT feedback?

   A:​ No.​ Unlike the 4WREE direct-operated valves, this standard 4WRZE pilot-operated model does not​ have LVDT feedback for the main spool position. It operates in open-loop for the main stage.

5. Q: What is the critical installation note?

   A:​ Ensure the T-port backpressure is below 210 bar. The pilot stage relies on external drain (Y port), so you must connect the Y port separately to the tank with minimal backpressure. Maintain high oil cleanliness (recommended NAS 1638 Class 8 or better for the main stage).