... ; 3.Material:Cast Iron, Ductile Iron, Stainless Steel, Bronze. Lug butterfly valve is widely used in metallurgical cast iron, petroleum, chemical industry ... , nodular cast iron, carbon steel, stainless steel, carbon steel completely coated rubber or fluorine plasticStemCarbon steel nickel plating p, stainless steelSeal ... -20°C~150°C API 609 Standard Worm Gear Operation Butterfly Valve