Tender For supply of 3 inch butterfly valve 1 , 4 inch butterfly valve 2 , teflon sheet 3 , 80 mm nb cs sorf flanges 4 , 80 mm nb cs erw short radius bend 5 , ms hexagonal full threaded nu bolts 6 , ms hexagonal full threaded nu bolts 7 , 6 mm thick mild steel plain plate 8 , rolled steel angles 9