... etc 4.With CE & ISO certificate Flange centerline butterfly valve is designed by DIN(BS) standard from DN50 to ... WCB Disc: ductile iron, stainless steel Stem: stainless steel Sealing ring: EPDM, NBR, VITON 5.Operation Mode: Level, ... butterfly valve), D343(double eccentric flanged butterfly valve), Grooved end type, Double disc wafer check valve, Resilient flapper check valve, Eccentric plug valve, ...