Keywords: Double Eccentric Type Butterfly Valve, Free Shaft, Serial 13. Pressure: PN16. Material: Body and disc in ductile iron both. Covered with epoxi (minimum thickness = 300 microns). Shaft: SS420, Seat: EPDM, Retainer: SS304. Body colour: Blue ral 5024>300 Microns. Disc colour: Black ral 9005>300 Microns.