R901170278 DBET-6X/200G24-8K4V German Rexroth proportional relief valve

FAQ:

1. Low-Power Coil (800 mA)

   The "-8"​ suffix indicates an 800 mA coil​ (compared to the standard 1600 mA). This reduces power consumption and thermal load on the solenoid, making it suitable for applications where heat buildup is a concern or when using compact amplifiers with lower current output.

2. Direct-Operated Seat Design (DBET)

   This valve uses a poppet and seat​ mechanism directly actuated by a proportional solenoid. It provides excellent sealing (zero leakage at closed center) and fast response but has a very low flow capacity (only 2 L/min). It is designed for pressure control, not for high-flow bypass.

3. External Electronics Required (/K4)

   The suffix /K4​ indicates a 3-pole plug socket​ for connection to an external control amplifier​ (e.g., Rexroth VT-5000 series). The valve itself has no on-board electronics (OBE), so you must provide an external amplifier that delivers the controlled current to the solenoid.

4. Pressure Setting (200)

   The "200"​ denotes the maximum adjustable pressure rating​ of 200 bar. The valve can be set proportionally from a minimum pressure (typically a few bar at 0 V/mA) up to 200 bar at maximum command signal.

5. Critical Installation Notes

   • External Amplifier:​ You must use a compatible proportional amplifier. The control signal (e.g., ±10 V) is input to the amplifier, which then drives the solenoid coil.

   • Flow Limitation:​ This valve is not a main system relief valve​ for high flows. It is typically used as a pilot valve for larger cartridge valves or for precise pressure control in small circuits. Exceeding the 2 L/min flow rating will cause excessive pressure override.

   • Return Line Pressure:​ Port T (return) must be connected directly to tank with minimal backpressure. High backpressure will directly reduce the effective setting pressure (P_set = P_solenoid - P_T).