SUN HYDRAULICS
RDDAFAV

***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 RDDAFAV (Material Number: RDDAFAV) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients by limiting pressure rise when the inlet port pressure reaches the valve setting. This normally closed, pressure-limiting valve opens smoothly and quietly to tank port 2, offering essentially zero leakage and high dirt tolerance. Its design ensures rapid response and resistance to silting, making it suitable for load-holding applications. The RDDAFAV features interchangeable 2-port relief cartridges that maintain the same flow path and cavity for a given frame size, allowing for maximum flexibility in cross-port relief circuits. It can handle maximum pressures at port 2, with back pressure directly adding to the valve setting at a 1:1 ratio. The valve is relatively insensitive to varying oil temperatures and oil-borne contamination. Adjustments can only be made when system pressure is removed; this involves checking the setting, removing pressure, adjusting the valve, and rechecking the new setting. For optimal repeatability, select a spring range where the desired relief setting is mid-range to high between minimum and maximum pressures. The RDDAFAV incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or machining variations. Additional specifications include a cavity T-10A series with a capacity of 25 gpm (95 L/min), a 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 factory pressure settings are established at 4 gpm (15 L/min), with reseat at 90% of the setting. The valve has specific dimensions for hex sizes and installation torques, ensuring precise installation and adjustment capabilities for various hydraulic applications.