Some process links involve corrosive media, such as sulfuric acid, hydrochloric acid, etc., and require the use of valves made of corrosion-resistant materials, such as stainless steel valves, fluorine-lined valves, etc. Some process links involve corrosive media, such as sulfuric acid, hydrochloric acid, etc., and require the use of valves made of corrosion-resistant materials, such as stainless steel valves, fluorine-lined valves, etc.