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Butterfly check valves are used to prevent backflow of fluid in a piping system. They operate using a disc that is mounted on a shaft and positioned in the middle of the pipe. When the fluid flows in the forward direction, the disc is pushed open, allowing the fluid to pass through freely. However, when the flow direction changes, the disc is pushed back against the seat of the valve, preventing any backflow of fluid.

Butterfly check valves are used in a variety of applications where backflow prevention is critical, including in water and wastewater treatment plants, pumping stations, and industrial processing facilities. They are preferred for their lightweight design, which makes them easy to install and operate, and their low-pressure drop, which means that they do not impede the flow of fluid in the piping system.

One of the main advantages of butterfly check valves is that they require very little maintenance. They have fewer moving parts than other types of check valves, which means that there are fewer components that can wear out or break down over time. Additionally, butterfly check valves are less likely to become clogged or obstructed, which can cause flow problems in the piping system.

Overall, butterfly check valves are a reliable and cost-effective solution for preventing backflow in a variety of applications.