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Cast Iron Dual Plate Check Valve is a type of check valve designed to allow fluid (typically liquid or gas) to flow in only one direction and prevent backflow. The "dual plate" refers to the valve's internal mechanism, which consists of two hinged plates that open to allow fluid flow and close to prevent reverse flow. As a check valve, its primary function is to prevent backflow. The dual plates open when the flow is in the intended direction, and they automatically close when the flow reverses, preventing reverse flow or siphoning.