The Sun CXHAXFN is a high-performance, pilot-to-open check valve with a pilot-assist feature, commonly known as a counterbalance valve. It is designed to control overrunning loads by allowing free flow from the directional valve (port 2) to the load (port 1), while blocking flow in the opposite direction until sufficient pilot pressure is applied at port 3. The pilot-assist function ensures smooth and stable operation, preventing load instability and chatter. This cartridge valve is designed to fit into a standard T-11A cavity, making it a versatile solution for motion control applications in various hydraulic systems.