wafer butterfly valve body:CI or DI disc:DI+Nickel painted,SS304/316,AL-BRONZE C954 seat:EPDM,NBR,VITON,PTFE shaft:SS316 ... /410 10 years professional butterfly Valve manufacture directly suppling ... , Ductile Iron GGG40, GGG50Disc: DI+Nickel painted,SS304/316,AL-BRONZE C954Seat: NBR ( Buan-N), EPDM, VITON, PTFEShaft & Pin: SS410, ...