Pneumatically-actuated ball valves use compressed air to open and close the valve and control the flow of chemically compatible media within a system. They have a higher closing force than electrically-actuated valves and are suitable for systems moving viscous liquids. General-purpose pneumatically-actuated ball valvescontrol the flow of compatible media in many commercial and industrial applications. meet NSF/ANSI 61 requirements for handling drinking water. Pneumatically-actuated ball valves for chemicals have wetted components (e.g., stems, valve body) meant for handling corrosive media of comparable chemical compatibility. Pneumatically-actuated ball valves for food and beverage meet either NSF (National Sanitation Foundation) or 3-A requirements for handling food, personal care, or dairy products.