0811404405 4WRL25V370M-3X/G24Z4/M German Rexroth proportional hydraulic valve

FAQ:

1. Pilot-Operated Design (High Flow)

   Unlike the direct-operated 4WRPE valves, the 4WRL series uses a two-stage design. A small NG6 pilot valve controls the main stage, allowing for high flow rates (370 L/min) with low hysteresis. This design is ideal for systems requiring both high power and high precision.

2. Control & Feedback

   The valve features integrated trigger electronics​ (indicated by the absence of /K0). It accepts a standard ±10 V DC​ command signal and provides LVDT spool position feedback​ for closed-loop control. The /Z4​ suffix confirms it comes with a ready-to-use plug and socket connection.

3. Flow Characteristic (370M)

   The M characteristic​ provides a progressive flow curve. At small spool openings, it offers fine metering for precise slow-speed control, while at larger openings, it delivers high flow for rapid actuator movement.

4. Fail-Safe Behavior

   This is a single-side actuated​ valve with spring return. In the event of power failure or signal loss, the spring returns the spool to a defined 4/4 fail-safe position​ (typically all ports blocked).

5. Critical Installation Notes

   • Pilot Oil Supply:​ As a pilot-operated valve, it requires a clean, stable pilot oil supply (port X). The minimum pilot pressure is typically 20 bar.

   • Cleanliness:​ Maintain high oil cleanliness (recommended ISO 4406 18/16/13 or better) due to the sensitive servo-quality pilot stage.

   • Mounting:​ Use the correct ISO 4401-08 (NG25) subplate to ensure proper port alignment and sealing.