SUN HYDRAULICS
RDBAKEN

***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics RDBAKEN (RDBAKEN) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients by maintaining a normally closed position until the inlet pressure reaches the valve setting. At this point, it opens to the tank port, throttling flow to limit pressure rise. Known for its smooth and quiet operation, this valve is essentially zero leak and dirt tolerant, making it suitable for load holding applications. With a maximum operating pressure of 5000 psi (350 bar) and a capacity of 12 gpm (45 L/min), it is capable of handling significant hydraulic loads. The valve\u2019s response time is typically 2 ms, ensuring rapid reaction to pressure changes. The RDBAKEN model incorporates Sun\u2019s floating style construction to minimize internal part binding due to excessive installation torque or machining variations. It features interchangeable functionality with all 2-port relief cartridges except pilot reliefs, allowing for consistent flow paths and cavity compatibility across different frame sizes. The valve can accept maximum pressure at port 2, making it suitable for cross-port relief circuits. Adjustments are made via an internal hex screw on the adjust screw, which requires system pressure removal before adjustment due to exposure to system pressure. The valve's reseat occurs at 85% of the setting with a maximum leakage rate of 10 drops/min (0.7 cc/min). For optimal performance and repeatability, select a spring range where the desired relief setting is midrange or higher between minimum and maximum pressures. The RDBAKEN model is relatively insensitive to varying oil temperatures and contamination levels. Cartridges configured with EPDM seals are intended for systems using phosphate ester fluids; petroleum-based fluids will damage these seals. The product's installation requires specific torque settings: Valve Hex Size of 3/4 in., Valve Installation Torque between 20-25 lbf ft (27-33 Nm), Adjustment Screw Internal Hex Size of 5/32 in., Locknut Hex Size of 1/2 in., and Locknut Torque between 80-90 lbf in (9-10 Nm).