The SUN FDBA-HAN is a high-performance, pilot-to-open check valve, commonly referred to as a counterbalance valve. Manufactured by Sun Hydraulics, this screw-in cartridge valve is designed to control overrunning loads by allowing free flow from the directional valve to the actuator, while blocking flow in the reverse direction until sufficient pilot pressure is applied. This ensures smooth, modulated control of motion and prevents loads from dropping or drifting. The FDBA-HAN is ideal for load-holding, motion control, and thermal relief applications in a wide variety of mobile and industrial hydraulic systems. This specific model features a 3:1 pilot ratio and a screw-type adjustment for precise pressure setting.