flange connection butterfly valve 1)Size:DN50-1200 2)PN:1. ... , Socket Weld Or Butt Weld OfferedProducts: We can produce gate, globe, check, ball and butterfly valves with the materials ... in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. We can offer special ... API 6D, CE/PED for many years and view the ISO 9001 as the minimum standard to maintain. flange connection butterfly valve ...