0811402083 DREBE6X-1X/175MG24K31F1M Rexroth proportional relief valve

FAQ:

1. Integrated Electronics (OBE) & Closed-Loop

   The "E"​ in DREBE​ confirms On-Board Electronics (OBE). This means the valve contains its own amplifier and position feedback sensor. You supply 24V DC power​ and a 4–20 mA command signal​ directly to the valve's K31 connector. This closed-loop design provides high accuracy (hysteresis ≤1%) and eliminates the need for an external VT-5000 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. High Reduced Pressure Rating (175 bar)

   The "175"​ denotes the maximum electrically adjustable reduced pressure​ at port A. This is a mid-range variant, suitable for applications requiring higher secondary pressures than the 75 bar version but lower than the 310 bar variant.

4. 3-Way Pressure Reducing Logic

   This valve operates as a 3-port device​ (P, A, T). It continuously compares the A-port pressure with the electrical setpoint. If the load pressure at A tries to exceed the setpoint (e.g., due to an overrunning load), the valve opens the A→T path to "dump" the excess pressure and maintain regulation.

5. Critical Installation Notes

   • Direct Signal Connection:​ Connect 24V DC and 4–20 mA signal directly to the K31 connector. Do not use an external amplifier.

   • Tank Line Backpressure:​ Port T must be connected to tank with minimal backpressure. High backpressure at T will be added to the A-port pressure, causing inaccurate regulation (P_A_effective = P_set + P_T_backpressure).

   • Pilot Flow:​ The valve uses an internal pilot supply (approx. 0.6 L/min), so no external pilot line is needed, but ensure your pump flow accounts for this constant consumption.

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.