The Fluorine-Lined Check Valve is a specialized corrosion-resistant anti-backflow valve, integrating the automatic reverse-prevention function of check valves with the extreme chemical inertness of fluoropolymer linings. Compliant with international standards (ANSI/ASME, ISO, GB, DIN), it features a metal valve body (WCB, stainless steel, cast iron) with full fluoroplastic lining (PTFE/PFA/FEP) on the inner surface, valve disc, and valve seat—ensuring complete isolation between corrosive media and metal components. Designed for automatic shutoff to prevent media backflow in harsh corrosion environments, it is widely used in chemical, pharmaceutical, and environmental engineering industries.