SUN HYDRAULICS
RDFAKSV

***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 RDFAKSV (RDFAKSV) is a direct-acting relief cartridge valve 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 set pressure, throttling flow to maintain system integrity. It features a smooth and quiet operation with near-zero leakage and is highly tolerant of dirt, making it immune to silting while providing rapid response times. The RDFAKSV is interchangeable with other 2-port relief cartridges of the same frame size and flow path, allowing for versatility in application. 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; thus, adjustments must be made only when the system is depressurized. For optimal performance, select a spring range where the desired relief setting falls between midrange and high of its minimum and maximum pressures. The RDFAKSV operates effectively despite varying oil temperatures or contamination levels in the hydraulic fluid. Backpressure at tank port 2 directly adds to the valve setting at a 1:1 ratio, which should be considered during system design. The cartridge incorporates Sun's floating style construction to reduce internal binding risks due to installation torque or machining variations. It supports a capacity of up to 50 gpm (200 L/min) and operates under a maximum pressure of 5000 psi (350 bar). The response time is typically around 2 milliseconds, with minimal valve leakage at reseat conditions. This model weighs approximately .50 lb (.25 kg) and requires specific torque settings for installation and adjustment operations.