... ,ISO,BS,DS 1000pcs a week,sanitary 3 pc butterfly valve Sanitary 3 pc butterfly valve1)Material:SS304,304L,316,316L2)Size ... ,brewery,food,pharmacy,berverage,cosmetics,chemical industry,etc6)Working principle:remote-controlled operation by the driving gear or manual operation by ... ,often opening type is pneumatic or manual type Sanitary 3 pc butterfly valve