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hoefert valves, also known as flap valves, are simple-structure control valves. Butterfly valves used for on/off control of media in low-pressure pipelines refer to valves where the closing element (valve disc or butterfly plate) is a disk that rotates around the valve shaft to achieve opening and closing. Valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metals, and radioactive media. They mainly serve to cut off and throttle flow in pipelines. The opening and closing element of a butterfly valve is a disk-shaped butterfly plate that rotates around its own axis within the valve body to achieve opening and closing.