... valves,safety valves,ball valves,butterfly valves,diaphragm valves,mud valve ect.And it has complete inspection equipment, such equipments as ... butterfly valve1,With 3D Eccentric structure ,the sealing ring of valve body adopts a multi-level structure of flexible eyelet so ... that the disc can contact the sealing surface of valve body uniformly and reliably,achieving no leakge of airtight seal ...