... are made by turning stem and disc together.Characteristics of Product:Flanged Butterfly Valve, Extension Rod Butterfly Valve: SizeDN50~DN2400Design StandardEN593End ... -12DiscQT450-10 A536 65-45-12Stem304 416 420 431SeatNBR, EPDM,Series 20 BodyCI, DI, WCBDiscDI, ALB, CF8M, 1.4529 Stem416, 420 ... :P-T Diagram & Performance Curve of Flow Rate for All Series:Product Show and Description for Order:Terms: