... ", 6" 2)Standard: DIN,SMS,ISO,3A 3)Material: stai Stainless Steel Pneumatic Butterfly Valve 1)Specification: DN15-200,1",1.5", 2 ... 4", 6" .2)Standard: DIN,SMS,ISO,3A.3)Material: stainless steel 304,314L,316,316L.4)Applications: pharmacy,beer,food,petroleum ... operation.6)Manual operation: Pulling handle, Multi-position handle .7)Pneumatic device: Normally closed,normally opened, opened and closed by two ...