DBET-61/350YG24K4V German made proportional relief valve Rexroth

A: The "350" in the model number signifies a maximum set pressure of 350 bar (the highest standard rating in this series). The valve body can withstand up to 420 bar maximum working pressure. The "V" suffix indicates FKM (Viton ®) seals, which provide superior chemical resistance, making this model compatible with phosphate ester fluids and aggressive media that standard NBR seals cannot handle.

A: Thanks to its FKM seals, this valve is compatible with mineral-based hydraulic oils (HL, HLP), synthetic biodegradable fluids (HETG, HEES), and phosphate ester fluids (HFDR). The FKM material offers excellent resistance to chemical degradation. However, it is not recommended for water-based fluids (HFA, HFB, HFC). Always maintain fluid cleanliness per ISO 4406 class 20/18/15 or better.

A: Yes, this valve requires an external control amplifier (such as VT-MSPA1-2X series) to operate. The valve receives 24V DC power and a proportional control signal (0-10V or 4-20mA) through its 3-pole DIN connector ("K4" designation). The amplifier converts the command signal to the appropriate current for the proportional solenoid.

A: For the DBET-6X series with 350 bar pressure rating, the maximum recommended flow rate is 2 liters/minute to ensure stable pressure control and prevent performance degradation. Exceeding this flow at high pressure settings may cause pressure instability, reduced accuracy, or premature wear.

A: For installation, ensure all system components (pipes, hoses, fittings) are rated for at least 350 bar working pressure. Use proper mounting torque on the subplate connections. For maintenance, the most critical factor is maintaining hydraulic fluid cleanliness (ISO 4406 class 20/18/15 or better recommended). Regularly check electrical connections for tightness and corrosion, inspect for external leaks around seals, and verify pressure response characteristics. For systems operating with phosphate ester fluids or at high pressures, more frequent inspections are advised.