R901496432 4WREE6W32-3X/V/24A1 Proportional valve German Rexroth

Key Differences & FAQs

1. Q: What is the key difference between R901496432 (/24A1) and R901496438 (/24F1)?

   A:​ The control signal type. R901496432 (/24A1) accepts ±10 V voltage input, while R901496438 (/24F1) accepts 4–20 mA current input. They are otherwise identical in mechanical construction, flow capacity (32 L/min), and mounting dimensions. Do not mix these versions without a signal converter.

2. Q: Can I use this valve with a PLC that has a 4–20 mA analog output?

   A:​ No, not directly.​ The /24A1​ suffix specifically requires a ±10 V voltage signal. If your controller outputs 4–20 mA, you should use the /24F1​ version (R901496438) or add a signal converter.

3. Q: What is the advantage of the "W" spool in this high-flow valve?

   A:​ The W spool has overlap​ (positive overlap), which creates a small dead zone around the center position. This provides excellent low-flow metering characteristics and smooth acceleration, which is critical for high-flow applications like press feeds or crane hoisting.

4. Q: Is an external amplifier card (e.g., VT-VSPA1) required?

   A:​ No.​ The "4WREE" series features Integrated On-Board Electronics (OBE), meaning the amplifier and closed-loop control circuitry are built into the valve. You connect the 24V power and ±10V signal directly to the valve's 7-pin 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 oil and provides a reference pressure for the LVDT sensor. A blocked drain line can lead to erratic spool movement, loss of control, and seal damage.

6. Q: Is the mounting interface the same as other NG6 proportional valves?

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