Ptfe Lined Flush Bottom Valves PTFE Lined Flush Bottom Valves are specialized valves designed to provide effective and reliable control of the flow of fluids, especially in industrial applications where corrosion resistance and cleanliness are crucial. These valves are typically lined with PTFE (Polytetrafluoroethylene), a highly inert and non-reactive material, making them suitable for handling aggressive and corrosive media. They are primarily used in the chemical, pharmaceutical, and food industries, as well as other applications where contamination must be minimized.