SUN HYDRAULICS
RDBALCN

***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 RDBALCN (RDBALCN) is a direct-acting relief cartridge valve designed to protect hydraulic components from pressure transients by limiting the pressure rise through throttling flow when the inlet port pressure reaches the valve setting. This normally closed, pressure-limiting valve is smooth, quiet, and features nearly zero leakage, making it highly dirt tolerant and immune to silting. It is known for its fast response time of approximately 2 milliseconds. The RDBALCN model is interchangeable with other 2-port relief cartridges except for pilot reliefs, sharing the same flow path and cavity size for a given frame size. It can handle a maximum operating pressure of 5000 psi (350 bar) and has a capacity of 12 gpm (45 L/min). This valve is suitable for cross port relief circuits as it accepts maximum pressure at port 2 and is ideal for load holding applications due to its insensitivity to varying oil temperatures and contamination. The adjustment screw seals are exposed to system pressure; thus, adjustments can only be made when the system pressure is removed. Users are advised to select a spring range where the desired relief setting falls between midrange to high within its minimum and maximum pressures to ensure repeatability. The valve's backpressure on tank port 2 adds directly to the valve setting at a 1:1 ratio. The RDBALCN features Sun's floating style construction, which minimizes internal part binding due to installation torque or machining variations. It comes with an EPDM seal option for systems using phosphate ester fluids but should not be exposed to petroleum-based fluids. With a reseat percentage of 85% of the setting and minimal leakage at reseat (10 drops/min or 0.7 cc/min), this cartridge valve provides reliable performance in demanding hydraulic applications.