SUN HYDRAULICS
RDJAQBN

***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 RDJAQBN (Material Number: RDJAQBN) 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 pressure reaches the valve setting, throttling flow to limit pressure rise. Known for its smooth and quiet operation, this valve is essentially zero-leak, dirt tolerant, immune to silting, and offers rapid response times. It features a design that allows it to be physically and functionally interchangeable with other 2-port relief cartridges of the same frame size. The RDJAQBN can handle maximum pressure at port 2 and is suitable for cross-port relief circuits as well as load-holding applications. The valve's adjust screw seals are exposed to system pressure, necessitating that adjustments be made only when the system is depressurized. Users are advised to select a spring range where the desired relief setting falls between midrange to high within the minimum and maximum pressures for optimal repeatability. The valve accommodates back pressure on tank port 2 directly additive to the valve setting at a 1:1 ratio. It incorporates Sun's floating style construction, reducing risks of internal parts binding due to excessive installation torque or machining variations in cavities and cartridges. The RDJAQBN model has a cavity T-18A with a series 4 capacity of up to 200 gallons per minute (760 liters per minute) and operates under a maximum pressure of 5000 psi (350 bar). Response time is typically around 2 milliseconds with maximum leakage at reseat being minimal. This model weighs approximately 3.30 lbs (1.50 kg) and utilizes Viton seal kits for enhanced durability in various fluid systems, particularly those using phosphate ester fluids while avoiding petroleum-based substances.