sanitary check valve DN25-150 and 1" - 6" standard: ISO,GB,DIN,3A,IDF etc Material quality:304,316L,321,304L,316 Sanitary stainless steel movable check valveMaterial quality:304,316L,321,304L,316Flux domination of pipeline: DN25-150 and 1" - 6"Standards: ISO, DIN, SMS, IDF etc