SUN HYDRAULICS
RBFACCN

***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 RBFACCN (RBFACCN) is a bidirectional, direct-acting relief cartridge designed as a normally closed, pressure-limiting valve that protects hydraulic components from pressure transients. This valve opens when the pressure differential between ports 1 and 2 exceeds the set limit, throttling flow to control the pressure rise in either direction. The internal modulation of this valve minimizes issues like noise and manifold erosion associated with cavitation. The adjust screw seals are exposed to pressure at port 1, requiring adjustment when pressure is removed or through port 2. It is important to select a spring range where the relief setting is midrange to high for optimal repeatability. This valve can handle varying oil temperatures and contamination effectively. All two-port relief cartridges are interchangeable in terms of flow path and cavity size for given frame sizes, thanks to Sun's floating style construction, which reduces internal binding risks due to installation torque or machining variations. The RBFACCN has a capacity of 30 gpm (120 L/min) and operates at a maximum pressure of 5000 psi (350 bar). It features a typical response time of 2 ms and maximum leakage at reseat of 30 drops/minute, with reseat set at 85% of the setting. The valve allows for adjustment with five clockwise turns to increase the setting and has a hex size of 1-1/8 inches (28.6 mm). Installation torque ranges between 45 - 50 lbf ft (61 - 68 Nm). A Viton seal kit (990303006) is available for this cartridge.