... , SUS316L Standard: ISO, DIN, 3A, SMS, IDF Sanitary Clamped Butterfly Valve Connection mode: Clamped Specification: 1"-4", DN25-DN100 Material quality ... forms: Normally closed, normally opened and opened and closed by two air flues separately. Application: Pharmacy, beer, food, dairy, ... , we can offer all kinds of the sanitary butterfly vlaves and can manufacture them according to the drawings