SUN HYDRAULICS
RDFA3AN

***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 RDFA3AN (Material Number: RDFA3AN) is a nonadjustable direct-acting relief cartridge designed to protect hydraulic components from pressure transients. This normally closed, pressure-limiting valve opens to the tank port when inlet pressure reaches the preset level, throttling flow to limit pressure rise. Known for being smooth, quiet, and essentially zero leak, this valve is dirt tolerant and immune to silting, offering fast response times. The RDFA3AN requires customers to specify settings as it is factory set and tamper-proof. It features EPDM seals for use with phosphate ester fluids; exposure to petroleum-based fluids can damage these seals. The valve accepts maximum pressure at port 2 and is suitable for cross-port relief circuits and load-holding applications. It remains relatively insensitive to variations in oil temperature and contamination, ensuring consistent performance. Users are advised to select a spring range where the desired relief setting falls between the midrange and high end of the specified limits for optimal repeatability. Back pressure on the tank port directly adds to the valve setting at a 1:1 ratio. The RDFA3AN incorporates Sun's floating style construction, minimizing internal binding due to installation torque or machining variations. It fits a T-3A cavity with Series 2 capacity of up to 50 gpm (200 L/min) and operates at a maximum pressure of 5000 psi (350 bar). The typical response time is 2 ms with maximum leakage at reseat being 10 drops/min (0.7 cc/min), reseating at 90% of its setting. The valve has a hex size of 1-1/8 inches (28.6 mm) and an installation torque requirement of 45-50 lbf ft (61-68 Nm). The model weighs approximately .50 lb (.25 kg), with Viton seal kits available under part number 990303006.