... 3.Fast Delivery 4.Supply OEM/ODM rubber seal butterfly valve SizeDN40 - DN1400Design StandardAPI 609End flangeEN1092 ... electric power, petroleum, petrochemical, heat supply, shipbuilding, medicine and metallurgy industries.Suitable Medium:Water, sewage,sea water, air ... and manufactured in accordance with the standards of GB, ASME, ANSI, API, BS, DIN, JIS etc. warious high quality DN 25 rubber seal ...