... 558-1 series13/20 Detail Image:Certificates:Brief Introduction:Butterfly valve is mainly consisted of body, stem, disc, seat ... and disc together.Characteristics of Product:Flanged Butterfly Valve, Extension Rod Butterfly Valve: SizeDN50~DN2400Design StandardEN593End flangeEN 1092, ANSI B16 ... -12DiscQT450-10 A536 65-45-12Stem304 416 420 431SeatNBR, EPDM,Series 20 BodyCI, DI, WCBDiscDI, ALB, CF8M, 1.4529 ...