SUN HYDRAULICS
RDFACAV

***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 RDFACAV (Material Number: RDFACAV) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients by limiting the pressure rise when it reaches the valve setting. This normally closed, pressure-limiting valve opens to the tank port 2, throttling flow smoothly and quietly with essentially zero leakage. It is dirt tolerant, immune to silting, and operates very quickly. The RDFACAV model is interchangeable with other 2-port relief cartridges of the same frame size, featuring a consistent flow path and cavity configuration. It can handle maximum pressure at port 2 and is suitable for cross-port relief circuits and load-holding applications. The valve's adjustment screw seals are exposed to system pressure, requiring pressure removal for setting adjustments. It performs reliably across varying oil temperatures and contamination levels. Users should select a spring range where the desired relief setting falls midrange to high for optimal repeatability. The valve has a maximum operating pressure of 5000 psi (350 bar) and a response time of approximately 2 milliseconds. Its installation torque ranges from 45 to 50 lbf ft (61 to 68 Nm), with an adjustment screw internal hex size of 5/32 in (4 mm). The locknut requires a torque of 80 to 90 lbf in (9 to 10 Nm). With a capacity of up to 50 gpm (200 L/min) at factory settings established at 4 gpm (15 L/min), this model ensures efficient performance under demanding conditions. Cartridges configured with EPDM seals are compatible with phosphate ester fluids but should not be exposed to petroleum-based substances. The Sun floating style construction minimizes internal binding risks due to installation or machining variations, making it a robust choice for hydraulic systems requiring reliable overpressure protection.