A sanitary butterfly valve, made of polished stainless steel, is used to manage the flow of fluids in pipes. It consists of a valve body and a disc that opens or closes to control flow. This type of valve is essential in industries like food production and pharmaceuticals because it maintains cleanliness. They can be operated manually or by air pressure and are available in sizes ranging from 1/2 to 12 inches. The valves can be attached to pipes using various methods such as clamps or welding. Unlike industrial valves, these are specifically designed to be hygienic and are made from non-toxic materials. They're commonly used because they prevent fluid from sticking to the valve’s interior, ensuring a clean process.