Among the most remarkable kinds of valves used are the fully welded ball valve, the trunnion mounted ball valve, the metal seated ball valve, and various kinds of butterfly valves such as the triple offset butterfly valve and the double offset butterfly valve. Valves are commonly distinguished based on their https://canvas.instructure.com/eportfolios/3168293/Home/Advanced_Sealing_Techniques_in_High_Performance_Butterfly_Valves