R900954064 4WRA10EA60-2X/G24K4/V Hydraulic proportional valve from Rexroth, Germany

Key Differences & FAQs

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

   A:​ The 4WRA series does not have LVDT spool position feedback. It is a simpler, cost-effective proportional valve that relies on the force balance of the solenoid and spring. The 4WREE series (e.g., R901496438) has closed-loop spool position control via LVDT, offering higher accuracy.

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

   A:​ EA​ is a specific spool code for Rexroth proportional valves. It typically indicates a spool with overlap and a progressive flow characteristic, suitable for general proportional directional control.

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

   A:​ No.​ The /G24K4​ suffix indicates that the valve has Integrated On-Board Electronics (OBE). The amplifier is built into the valve coil, so you only need to provide a 24V DC power supply and a control signal.

4. Q: What is the control signal for this valve?

   A:​ The integrated electronics typically accept a standard analog input (e.g., 0–10V or 4–20mA). You must check the specific datasheet for the OBE version to confirm the exact signal type, as it is not explicitly stated in the model suffix.

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 tank without significant backpressure. Also, the integrated electronics are sensitive to voltage drops; use a stable 24V DC power supply.