SUN HYDRAULICS
RDFACCN

***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 RDFACCN (RDFACCN) 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 reaches the preset valve setting. Notable for its smooth, quiet operation and virtually zero leakage, the RDFACCN is dirt tolerant and immune to silting, ensuring rapid response times. All two-port relief cartridges are interchangeable with the same flow path and cavity for a given frame size, allowing for flexibility in use across various applications. It can handle maximum pressure at port 2, making it suitable for cross-port relief circuits and load-holding applications. The valve's adjust screw seals are exposed to system pressure; therefore, adjustments must be made with the system depressurized. To ensure maximum repeatability, select a spring range where the desired relief setting falls within the mid-to-high range between minimum and maximum pressures. The cartridge is insensitive to changes in oil temperature and contamination levels. Backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. The RDFACCN features Sun's floating style construction to reduce internal binding risks due to excessive torque or machining variations. It has a capacity of 50 gpm (200 L/min) with factory settings established at 4 gpm (15 L/min). The maximum operating pressure is 5000 psi (350 bar), with a typical response time of 2 ms and maximum leakage at reseat of 10 drops/min (0.7 cc/min). The valve resets at 90% of its setting and requires five clockwise turns for adjustment increases. Its compact design includes specific dimensions for installation torque and hex sizes for adjustment screws and locknuts, ensuring precise application in hydraulic systems.