The衬氟 valve, also known as a fluoroplastic-lined corrosion-resistant valve, is made by placing polytetrafluoroethylene (PTFE) resin (or processed materials) into the inner wall of steel or iron valve pressure-bearing components using a molding (or inlay) method (the same method applies to the lining of various pressure vessels and piping accessories) or onto the outer surface of valve internal components. This utilizes its unique properties in resisting strong corrosive media to manufacture various types of valves and pressure vessels.