Ball Ball Check Valves | Cast Flow Ball Check Valves | Cast Flow Ball check valves are a type of check valve that uses a ball to prevent backflow in a piping system. These valves are designed to allow fluid to flow in one direction while automatically preventing reverse flow. The ball inside the valve is pushed away from the seat by the forward flow of fluid, allowing it to pass through. When the flow stops or... View Flanged PN 10 PN 16 150 lbs DIN ANSI EN-GJL-250 EN-GJS-400-15 (Nodular Cast Iron)