pneumatic butterfly valves Size Range:DN50~DN600 Structure:butterfly valve ... Connection: Flanged, Screwed, Socket Weld Or Butt Weld Offeredpneumatic butterfly valvesProducts: We can produce gate, globe, check, ball and butterfly valves with ... with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. We can offer special standard valves ... available to our customers. pneumatic butterfly valves