R900927231 4WREE10E50-2X/G24K31/A1V Electromagnetic valve, Rexroth hydraulic proportional valve

Key Differences & FAQs

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

   A:​ The 4WREE series has LVDT feedback​ (closed-loop spool position control), offering higher accuracy and repeatability. The 4WRAE series​ (e.g., R900954083) has no LVDT (open-loop force control), making it less precise but more cost-effective.

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 for general directional and flow control.

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

   A:​ No.​ The 4WREE​ designation and /G24K31​ suffix indicate 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 ±10V control signal.

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

   A:​ The /A1​ suffix explicitly indicates a ±10 V DC​ analog voltage input. If you need a 4–20 mA current input, you would need the /F1​ version.

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

   A:​ Yes.​ The "2X"​ series uses the standard ISO 4401-05-04-0-05​ 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 has integrated electronics and LVDT, ensure a stable 24V DC power supply to avoid voltage drops that can affect the closed-loop control performance.