SUN HYDRAULICS
RDBACEN

***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 RDBACEN (RDBACEN) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients by limiting pressure rise. This normally closed, pressure-limiting valve opens to tank port 2 when the inlet port 1 pressure reaches the valve setting, throttling flow smoothly and quietly. It is characterized by its dirt tolerance, zero leakage, and rapid response time of approximately 2 milliseconds. The valve is built for maximum operating pressures up to 5000 psi (350 bar) and has a capacity of 12 gpm (45 L/min). It is functionally interchangeable with other 2-port relief cartridges except for pilot reliefs, featuring the same flow path and cavity for a given frame size. The RDBACEN model is suitable for cross-port relief circuits as it can accept maximum pressure at port 2. It includes features such as a floating style construction to minimize internal binding risks due to installation torque or machining variations. The seals on the adjust screw are exposed to system pressure, requiring adjustments only when pressure is removed. The valve's insensitivity to varying oil temperatures and contamination makes it reliable in diverse conditions. The product is ideal for load-holding applications where back pressure on tank port 2 adds directly to the valve setting at a 1:1 ratio. For systems using phosphate ester fluids, EPDM seal configurations are available; however, exposure to petroleum-based fluids will damage these seals. Additionally, selecting a spring range where the desired relief setting falls between midrange and high ensures optimal repeatability of the valve settings. This model comes with an adjustment screw internal hex size of 5/32 inches (4 mm) and requires an installation torque between 20-25 lbf ft (27-33 Nm).