SUN HYDRAULICS
RDHAQEV

***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 RDHAQEV (RDHAQEV) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients by opening to tank port 2 when inlet port 1 reaches the set pressure, thereby throttling flow and limiting pressure rise. This valve is characterized by its smooth and quiet operation, zero leakage, dirt tolerance, and rapid response time of approximately 2 milliseconds. It is interchangeable with all other 2-port relief cartridges except pilot reliefs, sharing the same flow path and cavity for a given frame size. The valve can handle maximum pressure at port 2, making it suitable for cross-port relief circuits and load-holding applications. Adjustment requires depressurizing the system due to seals on the adjust screw being exposed to system pressure. The RDHAQEV is relatively insensitive to oil temperature variations and contamination, ensuring consistent performance. It features Sun's floating style construction to minimize internal binding risk from installation torque or machining variations. The valve has a capacity of 100 gpm (380 L/min) with a maximum operating pressure of 5000 psi (350 bar), and it reseats at 90% of the setting with minimal leakage at reseat conditions. For optimal repeatability, select a spring range where desired settings are mid-to-high within the range limits. Installation requires specific torques for both the valve (150-160 lbf ft) and locknut (80-90 lbf in), using specified hex sizes for adjustments. The RDHAQEV weighs approximately 1.30 lb (0.60 kg) and uses Viton seals available in cartridge seal kit number 990316006.