The Sun CACG-LGN is a high-performance, pilot-to-open check valve with an integral relief function, 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 reverse direction. Flow from port 1 to port 2 is prevented until sufficient pilot pressure is applied at port 3. The valve’s primary function is to provide smooth, stable, and controlled motion for hydraulic actuators, preventing load runaway and ensuring operational safety. Its robust construction makes it suitable for demanding industrial and mobile hydraulic applications.