... ", 6" 2)Standard: DIN,SMS,ISO,3A 3)Material: stai Stainless Steel Pneumatic Butterfly Valve 1)Specification: DN15-200,1",1.5 ... : stainless steel 304,314L,316,316L.4)Applications: pharmacy,beer,food,petroleum,dairy beverage,cosmetics.5)Working principle: Manual operation or driving device ...