The disc of the butterfly check valve is disc-shaped and rotates around the rotating shaft of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of the lifting butterfly check valve. It is suitable for large-diameter occasions with low flow rate and infrequent flow changes, but not suitable for pulsating flow. Its sealing performance is not as good as the lifting check valves. Butterfly check valves are divided into single-disc type, double-disc type and multi-disc type. These three types are mainly divided according to the valve diameter. The purpose is to prevent the medium from stopping flowing or backflowing and weakening the hydraulic impact.
