butterfly valves
butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow, supporting pressures up to 1000 bar and temperatures up to 752 °F (400 °C), depending on design and materials used.Body materials may include, but are not limited to, any of these materials:Stainless steel butterfly valve,Brass butterfly valve,Bronze butterfly valve,Chrome butterfly valve,Titanium butterfly valve,Casting steel butterfly valve, Forged steel butterfly valve,PFA-lined butterfly valve.Sizes typically range from 0.2 to 48 inches (0.5 cm to 121 cm). Valve bodies are made of metal,or metal with a ceramic;