SUN HYDRAULICS
RDHAQDN

***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 RDHAQDN (RDHAQDN) 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 pressure reaches the valve setting, ensuring smooth and quiet operation with essentially zero leakage. The RDHAQDN is dirt tolerant, immune to silting, and features a rapid response time of approximately 2 milliseconds. It is suitable for use in cross-port relief circuits and load-holding applications due to its ability to accept maximum pressure at port 2. The valve's construction incorporates Sun's floating style design, which minimizes the risk of internal parts binding due to excessive installation torque or machining variations. It can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 100 gallons per minute (380 liters per minute). The adjustment process involves removing system pressure before making changes, as the seals on the adjust screw are exposed to system pressure. For optimal performance, users should select a spring range where the desired relief setting falls between midrange and high within the minimum and maximum pressures. The RDHAQDN is relatively insensitive to varying oil temperatures and contamination, making it robust for various hydraulic applications. Additionally, backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. The model weighs 1.30 pounds (0.60 kg), with specific installation torque requirements for both the valve body and locknut adjustments ensuring secure fitting within hydraulic systems.