SUN HYDRAULICS
RDDAMSN

***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 RDDAMSN (RDDAMSN) is a direct-acting relief cartridge designed to protect hydraulic components from pressure transients by functioning as a normally closed, pressure-limiting valve. When the inlet port pressure reaches the valve setting, it opens to the tank port, throttling flow to limit pressure rise. This model is known for its smooth and quiet operation, essentially zero leakage, dirt tolerance, silting immunity, and rapid response time of approximately 2 milliseconds. It is interchangeable with other 2-port relief cartridges of the same frame size and flow path, accepting maximum pressure at port 2 for use in cross-port relief circuits. The valve's adjust screw seals are exposed to system pressure; thus, adjustments must be made when the system is depressurized. It performs reliably across varying oil temperatures and contamination levels. For optimal repeatability, select a spring range where the desired relief setting falls midrange or higher between minimum and maximum pressures. The RDDAMSN is suitable for load-holding applications with backpressure on port 2 directly adding to the valve setting at a 1:1 ratio. Cartridges with EPDM seals are compatible with phosphate ester fluids but can be damaged by petroleum-based fluids. The floating style construction minimizes internal part binding due to installation torque or machining variations. It fits into a Cavity T-10A Series 1 with a capacity of 25 gpm (95 L/min) and operates up to a maximum pressure of 5000 psi (350 bar). The valve features an adjustment mechanism that increases settings through clockwise turns and includes specific hex sizes for installation and adjustment screws.