Manually-operated butterfly valves control and throttle media flow within a system. They can be set to fully open, fully closed, or intermediate positions with a lever or handwheel. These valves are compact and lightweight and have a slim profile that minimizes pressure drops and ensures efficient flow. General-service manual butterfly valves control media flow in various industrial and commercial applications. High-performance manual butterfly valves are for high-pressure applications. Fire-protection manual butterfly valves meet applicable UL (Underwriters Laboratories) and National Fire Protection Association (NFPA) standards for use with fire protection systems. Food grade and sanitary manual butterfly valves meet applicable 3-A or NSF (National Sanitation Foundation) 51 standards for use with dairy or food and beverage products. Dry bulk transport manual butterfly valves are rated for low-pressure applications and control the flow of dry media.