Butterfly valves for water supply and drainage FJ&%$one-way seal m z m#k Z H&%l 3 H 3.2 Z two-way seal T44=&%AW.-.-IB$#BI B&%HM$4 6 -.,.-.4 2 M&4%5%fi%&+%a%ftm.#P%OCr19Ni9,lCrlSNil2MoZli.-,ZCuAllOFc3-.-.-.-NR,NR-NBR.NHR.EPDM.$5 GH/T 3280.GB/T 12225 HG/1 3091.,-GB/T 12225%i ZCuAllOFc3 E-E 1-I#I z-m?3-S H I E I 4-1QBR;5-%4Ez 6-%a%B#7-mai s-2*.l4l A2#;lt%RZkE;siB%R(S3tt3