Brief description of butterfly valve 1,ISO9001--2000 2,quick release hand wheel 3,we have 15 years experience Detailed description of ... Purpose and characteristicThe soft series of butterfly valves has several connection types such as clamp,flange,welding,protruding ear type(socket around ... -89, API608, API 6D, JPI 7S-48, BS5351, DIN3357. 2, flange size: JB/T74 ~ 90 (JB74 ~ 90), GB9112 ~ 9131, HGJ44 ~ ...