SUN HYDRAULICS
RDHAQSV

***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 RDHAQSV (RDHAQSV) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients by acting as a pressure-limiting valve. When the inlet port pressure reaches the valve's set point, it opens to tank port 2, throttling flow to limit pressure rise. This model is known for its smooth and quiet operation, virtually zero leakage, dirt tolerance, and quick response time of approximately 2 ms. It can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 100 gpm (380 L/min). The valve's reseat is at 90% of the setting with a maximum leakage rate at reseat of 10 drops/min (0.7 cc/min). The RDHAQSV features Sun\u2019s floating style construction to minimize internal part binding due to installation torque or cavity machining variations. It accepts maximum pressure at port 2 and is suitable for cross-port relief circuits and load-holding applications. The valve\u2019s adjustment requires system pressure removal; it adjusts via an internal hex screw with six clockwise turns needed to increase the setting. It is relatively insensitive to varying oil temperatures and contamination, ensuring reliable performance across different conditions. For optimal performance, select a spring range where the desired relief setting falls in the mid-to-high range between minimum and maximum pressures. Backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio, which should be considered in system design. The RDHAQSV weighs approximately 1.30 lb (0.60 kg) and requires specific installation torques for both the valve body and locknut for secure setup.