R901517458 4WREE6V1-32-3X/M/24F1 Rexroth hydraulic proportional valve

Key Differences & FAQs

1. Q: What is the main difference between this valve (R901517458) and the previous W-series valves?

   A:​ The spool type. This model uses a V1 spool (negative overlap/underlap), which provides near-zero dead zone and high linearity, similar to servo valves. In contrast, the W-series (e.g., R901496441) uses an overlap spool, which has a dead zone for smoother low-speed control but less linearity.

2. Q: What does the "M" in the suffix indicate?

   A:​ The /M​ suffix indicates that the valve is equipped with NBR (Nitrile) seals. This is a change from the more common /V (FKM/Viton) seals. NBR is suitable for standard mineral oils and offers a wider operating temperature range for general industrial applications.

3. 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 (e.g., R901496432 for W-spool, or the corresponding V1-spool variant with /24A1).

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.