SUN HYDRAULICS
RDHAQWN

***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 RDHAQWN (RDHAQWN) is a direct-acting relief cartridge designed for hydraulic systems to prevent pressure transients and protect components. This normally closed, pressure-limiting valve opens to the tank port when the inlet pressure reaches the set threshold, throttling flow to control pressure rise. Notably smooth and quiet in operation, it boasts near-zero leakage, dirt tolerance, and resistance to silting, with a rapid response time of approximately 2 milliseconds. The RDHAQWN is interchangeable with other 2-port relief cartridges except for pilot reliefs, sharing the same flow path and cavity for a given frame size. It accepts maximum pressure at port 2 and is suitable for cross-port relief circuits. The valve's seals on the adjust screw are exposed to system pressure; hence adjustments should only be made when pressure is removed. It is recommended to select a spring range where the desired setting falls midrange or higher between minimum and maximum pressures for optimal repeatability. The RDHAQWN can be used in load-holding applications, with backpressure on tank port 2 directly affecting the valve setting at a 1:1 ratio. Sun Hydraulics' floating style construction minimizes binding risks due to installation torque or machining variations. With a cavity of T-16A Series 3 and a capacity of up to 100 gpm (380 L/min), this cartridge operates at pressures up to 5000 psi (350 bar). It features minimal leakage at reseat (10 drops/min) and resets at 90% of its setting. The adjustment mechanism includes an internal hex screw requiring clockwise turns for increased settings, complemented by specific torque requirements for installation and locknut adjustments. This robust unit weighs approximately 1.30 lb (0.60 kg) and incorporates Viton seals as standard in its design.