SUN HYDRAULICS
RDFALBE

***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 RDFALBE (RDFALBE) is a direct-acting relief cartridge valve designed to protect hydraulic systems from pressure transients. This normally closed, pressure-limiting valve opens to the tank port when inlet pressure reaches the set threshold, effectively throttling flow to prevent excessive pressure buildup. Known for its smooth and quiet operation, this valve exhibits near-zero leakage and is highly tolerant to dirt, making it immune to silting. It features a rapid response time of approximately 2 milliseconds and can handle a maximum operating pressure of 5000 psi (350 bar). The RDFALBE model is interchangeable with other 2-port relief cartridges of similar frame size, offering versatility in application. This relief cartridge is particularly suitable for cross-port relief circuits and load-holding applications due to its ability to accept maximum pressure at port 2. The valve's adjust screw seals are exposed to system pressure; therefore, adjustments must be made with the system depressurized. It operates effectively across varying oil temperatures and contamination levels, ensuring consistent performance. The valve's backpressure on the tank port directly affects its setting at a 1:1 ratio. For optimal performance, it is recommended to select a spring range where the desired relief setting falls within the mid-to-high range between minimum and maximum pressures, maximizing repeatability. The Sun Hydraulics RDFALBE incorporates floating style construction that minimizes internal binding risks due to installation torque or machining variations. This model weighs 0.50 lb (0.25 kg) and requires specific installation torques for both the valve body and locknut components. Cartridges configured with EPDM seals are compatible with phosphate ester fluids but are not suitable for petroleum-based products as they may cause seal damage. The Sun Hydraulics RDFALBE provides reliable protection in hydraulic systems requiring fast response times and robust dirt tolerance capabilities.