The Sun CBEALHN is a high-performance, pilot-to-open check valve with a pilot-assisted relief function, commonly known as a counterbalance valve. It is designed to reliably control overrunning loads in hydraulic systems. The valve allows 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 integrated relief function provides essential overpressure protection for the circuit. As a cartridge-style valve, it fits into the standard T-11A cavity, ensuring easy integration and serviceability in a wide range of hydraulic applications.