welded butterfly valve 1.certificate:ISO9001,API 2.size:1.5"~48" ... :ss304,ss316 4.standard:AISI,JIS and so on welded butterfly valve 1.Size: 1"-6" 2.Standard: DIN,SMS,3A ... ,BS 3.For dairy, beer, beverage industry4.Sanitary Butterfly Valve, stainless steel butterfly valve, clamp butterfly valve5.Material quality: SUS304, SUS316L6.Standard: DIN ...