Butterfly valves are control valves that use a rotating disc to regulate the flow of fluid in a piping system. The valve is called a butterfly valve because the disc is shaped like a butterfly with two half-circles joined at a central point. These valves are commonly used in industrial applications such as HVAC systems, chemical processing plants, and water treatment plants. Droplight closure refers to the ability of a butterfly valve to close quickly and effectively. A droplight closure ensures that the valve closes tightly and prevents any leakage of fluid. This is especially important in applications where the fluid being transported is hazardous or toxic. Offset refers to the position of the valve disc in relation to the centerline of the piping system. Offset butterfly valves have the disc positioned to one side of the centerline of the pipe, which allows for a more efficient flow of fluid. This design is particularly useful in high-pressure applications as it reduces the amount of turbulence caused by the valve, which can cause wear and tear on the piping system over time. Offset butterfly valves are also used in applications where space is limited or when the piping system is located in a tight area.

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