... : 1) Material: a) Ductile iron ASTM A536, GGG500-7 and QT450-12 b) Disc: ductile i Features:1) Material: a) Ductile iron ... ASTM A536, GGG500-7 and QT450-12 b) Disc: ductile iron ASTM, A536/EPDM or QT450-12/EPDM c) Stem: bronze ASTM B ... ) Hand wheel: ductile iron ASTM-A-536, GGG500-7 and QT450-12 or carbon steel welding2) Size: 50-600mm3) Standard: AWWA C515 ...