... of grey cast iron, cast steel, ductile iron,2, the valve plate quality: stainless steel, galvanized steel sheet3, ... °C4, driving-model: manual and electric, pneumaticProduct features1, novel design, reasonable structure, light weight.2, as a result ... , good sealing, long service life.4, valve internal and external surface according to medium and ... drawings and samples are welcomed. Flanged butterfly valve