SUN HYDRAULICS
RDBACCN

***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 RDBACCN (RDBACCN) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients by acting as a pressure-limiting valve. This normally closed valve opens when the inlet port pressure reaches the set threshold, allowing flow to the tank port and limiting any further pressure rise. Known for their smooth and quiet operation, these valves are highly resistant to dirt and silting, ensuring reliable performance with essentially zero leakage. The RDBACCN model is interchangeable with other 2-port relief cartridges of the same frame size, making it versatile for various applications. This valve can accept maximum pressure at port 2, making it suitable for cross port relief circuits. It features seals on the adjust screw exposed to system pressure, requiring adjustments only when the system is depressurized. The valve's performance remains stable across varying oil temperatures and contamination levels. To achieve optimal repeatability, it is recommended to select a spring range where the desired relief setting falls in the mid-to-high range of its capacity. The RDBACCN is appropriate for load-holding applications and has a backpressure on tank port 2 that directly adds to the valve setting in a 1:1 ratio. For systems using phosphate ester fluids, EPDM seal configurations are available; however, these should not be exposed to petroleum-based substances as they may cause damage. The cartridge employs Sun's floating style construction to reduce internal part binding due to installation torque or machining variations. Specifications include a cavity type T-162A with a series 0 capacity of up to 12 gpm (45 L/min), maximum operating pressure of 5000 psi (350 bar), and typical response time of 2 ms. The valve's maximum leakage at reseat is limited to 10 drops per minute, approximately 0.7 cc/min, with reseat occurring at 85% of the set value.