SUN HYDRAULICS
RDBACWV

***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 RDBACWV (RDBACWV) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens to tank port 2 when the inlet port 1 reaches the set pressure, throttling flow to limit pressure rise. Known for being smooth and quiet with essentially zero leak, this valve is dirt tolerant, immune to silting, and provides fast response times. It is physically and functionally interchangeable with all 2-port relief cartridges except pilot reliefs, sharing the same flow path and cavity for a given frame size. The valve can withstand maximum pressure at port 2, making it suitable for cross-port relief circuits and load-holding applications. It incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or machining variations. The RDBACWV model is relatively insensitive to varying oil temperatures and contamination. Its adjustment screw seals are exposed to system pressure; hence, adjustments must be made with the pressure removed following a specific procedure: check setting, remove pressure, adjust valve, then recheck setting. Users should select a spring range where the desired relief setting falls midrange or higher between minimum and maximum pressures for optimal repeatability. Backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. This model features a cavity T-162A series with a capacity of 12 gpm (45 L/min), factory settings established at 4 gpm (15 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, and maximum valve leakage at reseat of 10 drops/min (0.7 cc/min). The reseat occurs at approximately 85% of the setting. The adjustment requires five clockwise turns to increase settings, with specified hex sizes for various components ensuring proper installation torque values are maintained.