SUN HYDRAULICS
RBFALCN

***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 RBFALCN (RBFALCN) is a bidirectional, direct-acting relief cartridge designed as a normally closed, pressure-limiting valve to protect hydraulic components from pressure transients. It operates by opening when the pressure differential between ports 1 and 2 surpasses the valve setting, effectively throttling flow to limit pressure rise in either direction. This valve features modulating action within the cartridge, making it resistant to issues like cavitation noise and manifold erosion. The adjust screw seals are exposed to pressure at port 1, necessitating adjustment only when pressure is removed or using port 2 for setting. The valve is engineered to be relatively insensitive to oil temperature fluctuations and contamination. Users should select a spring range where the desired relief setting is midrange or higher for optimal repeatability. This model is interchangeable with other two-port relief cartridges of the same frame size, featuring Sun's floating style construction to prevent internal part binding due to installation torque or machining variations. Key specifications include a T-3A cavity series with a capacity of 30 gpm (120 L/min), maximum operating pressure of 5000 psi (350 bar), typical response time of 2 ms, maximum valve leakage at reseat of 30 drops/minute, and reseat at 85% of the setting. The hex size is 1 1/8 inches (28.6 mm), with an installation torque of 45\u201350 lbf ft (61\u201368 Nm). The seal kit for this cartridge is Viton: 990303006.