The TTV Wafer Pattern PTFE Seat Actuated Butterfly Valves are mainly used for highly corrosive applications that require optimum material resistance as well as clean or food grade requirements. Wafer Pattern concentric design features a non-toxic PTFE internal seal which also partially covers the outer body of the valve for perfect sealing with counter flanges. Thus avoiding any possibility of cross-contamination and providing a butterfly valve that is extremely resistant to chemicals and solvents.