Lined valves are specialized flow control devices designed for use in highly corrosive or abrasive service conditions. Instead of being made entirely from exotic metals, which can be expensive, these valves feature a durable metallic body lined internally with materials such as PTFE, PFA, or other fluoropolymers. The lining acts as a protective barrier, preventing the process media from contacting and degrading the valve’s body or internal components. This design allows lined valves to provide a cost-effective and long-lasting solution for industries such as chemicals, petrochemicals, pharmaceuticals, and water treatment where aggressive fluids or slurries are present.