R901496451 4WREE6W1-16-3X/V/24F1 Proportional valve German Rexroth

Key Differences & FAQs

1. Q: What is the difference between R901496451 (/24F1) and R901496437 (/24A1)?

   A:​ The control signal. R901496451 (/24F1) requires a 4–20 mA current signal, while R901496437 (/24A1) requires a ±10 V voltage signal. Mechanically, they are identical and share the same NG6 mounting interface.

2. Q: Can I use this valve with a ±10V PLC output?

   A:​ No.​ The /24F1​ suffix mandates a 4–20 mA current input. If your controller outputs ±10V, you must use the /24A1​ version or add a signal converter.

3. Q: What does "W1" spool mean compared to "W16"?

   A:​ W1​ indicates a specific variant of the overlap spool with a particular flow characteristic. Functionally, it behaves similarly to the standard W spool (providing smooth metering at low flows), but it is part of the newer 3X series with updated specifications.

4. Q: Is an external amplifier required?

   A:​ No.​ This valve features Integrated On-Board Electronics (OBE), which includes the amplifier and closed-loop spool position control. You connect the 24V power and 4–20 mA signal directly to the valve's electrical connector.

5. Q: What is the critical installation note for the drain port?

   A:​ The Y port (drain)​ must be connected directly to the tank without any pressure. It drains internal leakage and provides a reference for the LVDT sensor. A blocked or pressurized drain line will cause erratic valve behavior and potential failure.

6. Q: Is the mounting compatible with other NG6 valves?

   A:​ Yes.​ The "3X"​ designation confirms it uses the standard ISO 4401-03-02-0-05​ interface. It is directly interchangeable with other NG6 "3X" series valves without modifying the subplate.