PTFE lined butterfly valve ensures full sealing in environments where many elastomers are unsuitable, such as in the chemical, pharmaceutical, and food industries, with a two-piece body design and silicone or Viton elastomer support. Additionally, there is an alternative with AISI 316 / 1.4408 stainless steel disc material, coated with 3mm PTFE, for fluids where AISI 316 material is not suitable. Teflon Coated, Teflon Sealed, PTFE, PFA Coated Butterfly Valves.