This double flange butterfly valve use the materials ductile iron for valve body, for the disc, we choice materials SS304, and for the connection flange, we offer the PN10/16, CL150 for your choice, This is centerlined butterfly valve. Windly used in Food, medicine, chemical, petroleum, electric power, light textile, paper and other water supply and drainage, gas pipeline for regulating the flow and cut off the role of fluid.