I. Overview D671X pneumatic soft sealing butterfly valve The product consists of a rubber seal butterfly valve plate and carbon steel or stainless steel, stem composition. For temperature ≤120 ℃ such as textile, paper, food, pharmaceutical, chemical, oil, electricity, water supply and drainage, etc., the role of the media flow and the closure of the gas pipeline to make adjustments. Second, the main features of an innovative design, reasonable, unique structure, light weight, open and close quickly. 2, the operation torque is small, easy to operate, energy smart. 3, can be installed in any position, and easy maintenance. 4, the seal can be replaced, reliable sealing performance bi-directional sealing reach zero leakage. 5, sealing material aging, corrosion resistance and long service life.