Below is a list of High Performance Butterfly Valves manufacturers from West Chester, Pennsylvania. High performance butterfly valves are mechanisms that control the rate of flow for fluids in a pipe by providing a tight seal that functions correctly while under very high pressure. Butterfly valves use a round disc controlled by a control lever or wheel to completely shutoff a pipe. When the lever is moved a quarter turn, the disc stands upright and perpendicular to the flow of fluids, closing the valve and blocking any liquid or gas from flowing down the pipe.