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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.

An API Bellows-Sealed Globe Valve is a specialized type of globe valve that meets the requirements of the American Petroleum Institute (API) standards, commonly used in the oil, gas, and petrochemical industries. The primary feature of this valve is the metallic bellows seal, which ensures that the valve stem area is sealed effectively, preventing leakage of hazardous fluids or gases.