SUN HYDRAULICS
RDDAMSV

***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 RDDAMSV (RDDAMSV) is a direct-acting relief cartridge valve specifically designed for hydraulic systems to protect components from pressure transients. This valve remains normally closed and opens when the inlet port pressure reaches the preset limit, thereby directing flow to the tank port to manage pressure levels. Known for its smooth and quiet operation, it features zero leakage and is highly resistant to dirt and silting. The RDDAMSV is interchangeable with other 2-port relief cartridges of the same frame size, allowing for flexibility in design and maintenance. This model can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 25 gpm (95 L/min). It is suitable for use in cross-port relief circuits and load-holding applications. The valve's design ensures that it remains relatively unaffected by changes in oil temperature or contamination, enhancing its reliability across various conditions. Its adjustment screw seals are exposed to system pressure, requiring pressure removal before any adjustments can be made. The RDDAMSV incorporates Sun's floating style construction, which minimizes internal binding issues due to excessive installation torque or machining variations. It also supports EPDM seals for compatibility with phosphate ester fluids, although these seals are not suitable for petroleum-based fluids. For optimal performance, it's recommended to select a spring range where the desired relief setting falls between midrange and high within the specified limits. The valve features a quick response time of approximately 2 ms and maintains a reseat rate at 90% of its setting. Installation requires specific torque settings: 30-35 lbf ft (41-47 Nm) for the valve itself and 80-90 lbf in (9-10 Nm) for the locknut. This robust design ensures reliable overpressure protection in demanding hydraulic applications.