R901496427 4WREE6E16-3X/V/24A1 Rexroth Proportional Valve Germany Rexroth

FAQs for Rexroth 4WREE6E16-3X/V/24A1

1. Q: Does this valve need an external amplifier?

   A:​ No.​ The "4WREE" series designation and the "/24A1" suffix confirm that this valve has Integrated On-Board Electronics (OBE). It accepts a direct analog command signal (±10V) and contains the necessary amplifier circuitry internally. You can connect it directly to your PLC's analog output card (with proper shielding) without an external VT-VSPA1-type amplifier card.

2. Q: What is the difference between the "E" spool and the "W" or "V" spools?

   A:​ The "E" spool is a zero-overlap (critical center) spool with a linear flow characteristic. It provides very high resolution and repeatability, especially at low flows, making it ideal for precise position or speed control. "W" spools are also zero-overlap but may have a different flow gain curve. "V" spools are typically progressive (orifice-type) and are better for general flow control where fine low-speed control is less critical. The "E" spool is a high-performance choice for closed-loop systems.

3. Q: The pressure rating shows 350 bar. Is that safe for a 315 bar system?

   A:​ Yes, it is safe and standard.​ The 4WREE series in the "3X" generation is rated for a maximum operating pressure of 350 bar​ on the P, A, and B ports. This provides a safety margin when used in systems with a 315 bar rated pump or relief valve. Always ensure the T (tank) port pressure does not exceed 210 bar.

4. Q: What is the purpose of the drain port (Y), and how must it be installed?

   A:​ The drain port (Y) is mandatory. It serves two critical functions: 1) It drains internal leakage oil from the valve's solenoid cavities. 2) It provides a reference pressure for the LVDT position sensor. This port must be connected directly to the tank (reservoir) with a dedicated, non-pressurized line.​ If the drain line is blocked or pressurized, it can cause valve malfunction, internal damage, or inaccurate spool positioning.

5. Q: Can I replace an older 4WRE valve (without OBE) with this 4WREE valve?

   A:​ Hydraulically, yes (footprint is ISO 4401-03); Electrically, no.​ The mounting pattern and port sizes are identical. However, the older 4WRE valve requires an external amplifier, while the 4WREE has a built-in OBE. A swap would require rewiring: removing the external amplifier and connecting the ±10V signal and 24V power directly to the valve's 7-pin connector. The control program usually does not need change if the command signal range remains ±10V.

6. Q: What does the "3X" in the model number mean?

   A:​ "3X" denotes the component series​ (30-39). This indicates the physical dimensions and mounting pattern. All "3X" series NG6 valves have identical installation dimensions, allowing for direct replacement with other 4WREE...-3X valves without modifying the manifold.