R901382350 4WRPEH6C3B40L-3X/M/24F1 Proportional hydraulic solenoid directional valve from Rexroth, Germany

FAQ:

1. Spool Type (C3)

   The C3 spool​ is a zero-overlap (critical center) spool​ with servo-valve quality. This design provides high linearity and fast response, ideal for closed-loop control applications. The "B40L" indicates a specific flow gain characteristic (40 L/min​ with linear characteristic "L").

2. Control & Feedback (/F1)

   The /F1​ suffix indicates a 4...20 mA current input​ for the command signal. This is a key difference from the previously discussed /A1​ variants (which use ±10V). The valve features integrated LVDT position feedback, enabling full closed-loop control of the spool position. It has integrated on-board electronics (OBE), so it does not require an external amplifier.

3. High Dynamic Performance

   As a direct-acting valve with integrated electronics, the 4WRPEH series offers high frequency response​ and fast step response. It is suitable for applications requiring servo-like performance with the robustness of a proportional valve.

4. Fail-Safe Behavior

   This valve is single-side actuated​ (single proportional solenoid with spring return). In the event of power failure or signal loss (current < 2 mA), the spring returns the spool to a defined 4/4 fail-safe position​ (typically all ports blocked or P to B, A to T, depending on spool configuration).

5. Critical Installation Notes

   • Cleanliness:​ Maintain high oil cleanliness (recommended ISO 4406 18/16/13 or better) due to the sensitive servo-type spool and sleeve assembly.

   • Current Signal:​ The /F1 version uses a 4...20 mA current loop, which is less susceptible to noise than voltage signals over long cable runs. Ensure your PLC or controller outputs a current signal.

   • Mounting:​ Use the correct ISO 4401-03 subplate to ensure proper port alignment and sealing.