Y swing check valves ensure system fluids travel in one direction and prevent backflow. The valve's y-body shape allows the disc to completely move out of the fluid path and reduces pressure drops. They can be accessed for maintenance and inspection while the valve is still connected to the system plumbing. Flowing media on the inlet side swing the disc away from the seat, opening the valve. When inlet pressure drops below outlet pressure, the disc will swing closed to prevent backflow and contamination. They're used in various industrial applications, such as wastewater treatment facilities.