R900902097 4WRA10E60-2X/G24N9K4/V Rexroth proportional valve

Key Differences & FAQs

1. Q: What is the main difference between this valve (4WRA) and the 4WREE series?

   A:​ The 4WRA series is open-loop​ (no spool position feedback/LVDT) and requires an external amplifier. The 4WREE series has integrated electronics (OBE) and closed-loop spool control, offering higher accuracy. This 4WRA valve is a more cost-effective solution for applications where extreme precision is not critical.

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

   A:​ The E spool​ is a critical center (zero overlap) spool. It provides a direct relationship between the control signal and the opening area, offering good metering characteristics. It is a general-purpose spool for directional and flow control.

3. Q: Does this valve have built-in electronics?

   A:​ No.​ The /G24N9K4​ suffix indicates that the valve has no integrated amplifier (OBE). The "K4" denotes a plug connection for an external amplifier. You must purchase and wire a separate control electronics card (e.g., VT-VRPA1-50 or VT-VSPA1-50) to drive this valve.

4. Q: What is the purpose of the "N9" suffix?

   A:​ The /N9​ suffix indicates the presence of a concealed manual override. This allows you to manually shift the spool for testing or emergency operation without energizing the solenoid.

5. Q: Is the mounting compatible with other NG10 valves?

   A:​ Yes.​ The "2X"​ series uses the standard ISO 4401-05-04-05​ mounting interface for NG10 valves. It is directly interchangeable with other NG10 "2X" series valves.

6. Q: What is the critical installation note?

   A:​ Ensure the T port (tank)​ is connected to the tank without significant backpressure. Since this valve uses external electronics, you must correctly match the amplifier's output stage to the valve's coil impedance (typically specified in the amplifier manual for NG10 valves).