R900949757 4WRAE10W1-60-2X/G24N9K31/F1V Rexroth hydraulic proportional solenoid valve

Key Differences & FAQs

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

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

2. Q: What does the "W1" spool mean?

   A:​ The W1 spool​ is an overlap spool​ with a specific metering characteristic. It has a small dead zone at the center position, which provides smooth acceleration/deceleration and prevents actuator creep, making it ideal for applications requiring fine control at low flows.

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

   A:​ No.​ The 4WRAE​ 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 4–20 mA control signal.

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

   A:​ The /F1​ suffix explicitly indicates a 4–20 mA​ analog current input. This is the key difference from the /A1​ version (e.g., R900954089), which uses a ±10 V DC voltage input.

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 (e.g., 4WRA10, 4WRAE10).

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, ensure a stable 24V DC power supply to avoid voltage drops that can affect performance. The 4–20 mA signal is less susceptible to noise over long distances compared to voltage signals.