0811402044 DBE6X-1X/180G24-8NZ4M Hydraulic proportional relief valve from Rexroth, Germany

FAQ:

1. Pilot-Operated Design (DBE6X vs. DBET)

   This valve uses a two-stage design: a small direct-operated pilot stage controls a larger main spool stage. This allows it to handle high flows (40 L/min)​ with low hysteresis, making it suitable for main system relief​ applications. This is a key difference from the DBET series, which are only for pilot flow or very small circuits.

2. Low-Power Coil (0.8 A)

   The "-8"​ suffix indicates a low-power coil​ with a maximum current of 0.8 A. This reduces power consumption and heat generation compared to standard 2.5 A coils, making it compatible with smaller, more efficient external amplifiers.

3. Pressure Rating (180 bar)

   The "180"​ denotes the maximum electrically adjustable pressure rating​ of 180 bar. The valve's mechanical pressure limit (with maximum coil current) is higher (approx. 315 bar), providing a safety margin. The working pressure at port P must not exceed 315 bar.

4. External Electronics Required (NZ4)

   The NZ4​ connector indicates a proportional solenoid without on-board electronics (OBE). You must use an external proportional amplifier​ (e.g., Rexroth VT-5000 series or equivalent) to convert a command signal (0–10 V, 4–20 mA) into the controlled coil current.

5. Critical Installation Notes

   • External Amplifier:​ Mandatory. The valve cannot function without an external amplifier to drive the solenoid.

   • Subplate Mounting:​ Requires an NG6 subplate (ISO 4401-03-02-0-94). The valve itself has no integrated ports.

   • Return Line Pressure:​ Port T pressure must be kept low (ideally tank pressure). High backpressure at T will reduce the effective cracking pressure (P_effective = P_set - P_T).