R901278156 DREE10-6X/200YG24K31F1M Proportional relief valve German Rexroth hydraulic valve

FAQ:

1. Integrated Electronics (OBE)

   The "E"​ in DREE​ confirms On-Board Electronics (OBE). This means the valve contains its own amplifier. You supply 24V DC power​ and a 4–20 mA command signal​ directly to the valve's K31 connector. This simplifies wiring and eliminates the need for an external VT-VSPA amplifier.

2. 4–20 mA Control Signal (F1)

   The "F1"​ suffix indicates the control input is a 4–20 mA current signal. This is different from the common 0–10 V variant (A1) and is often preferred for industrial applications due to its noise immunity over long cable runs.

3. Pressure Rating & Flow (200 bar / 200 L/min)

   The "200"​ denotes the maximum electrically adjustable reduced pressure​ at port A. This is a high-flow variant​ (max flow 200 L/min), suitable for large actuator circuits or secondary pressure control in high-power systems.

4. External Pilot Drain (Y) & No Maximum Pressure Limiter

   • "Y": The pilot control oil must be drained externally via port Y. This port must be connected directly to the tank with minimal backpressure. High backpressure at Y will cause inaccurate pressure regulation.

   • No "M" after "200Y": The absence of an "M" code (e.g., compared to 200YMG24) indicates that this valve does not have a mechanical maximum pressure limiter. The maximum pressure is solely controlled by the electronics.

5. Critical Installation Notes

   • Port Y Drain:​ Must be piped separately to tank​ with a line diameter ≥ 5 mm and length < 2.5 m to avoid backpressure issues.

   • Zero Signal Pressure:​ With a 4 mA command signal (or 0 V equivalent), the valve maintains a minimum pressure of approximately 2 bar​ at port A.

   • Subplate:​ Requires an NG10 subplate according to ISO 5781-AG-06-2-A (e.g., Rexroth RE 45062 series).

Correction:​ Your description mentioned "proportional relief valve", but this model is specifically a proportional pressure reducing valve. It controls the downstream (A-port) pressure, not the system relief pressure.