A flange is an external or internal ridge, or rim (lip), for strength, as the flange of an iron beam such as anI-beam or a T-beam; or for attachment to another object, as the flange on the end of a pipe, steam cylinder, etc., or on the lens mount of a camera; or for a flange of a rail car or tram wheel. Thus flanged wheels are wheels with a flange on one side to keep the wheels from running off the rails. The term "flange" is also used for a kind of tool used to form flanges. Pipes with flanges can be assembled and disassembled easily.

Hangzhou Boda Purity Equipment Co., Ltd. is located at the beautiful bank of Fuchun River, in the suburb of Hangzhou, between West Lake and national scenic spots—Thousand-island Lake and Yaolin Wonderland, with National Highway 320 passing through, enjoying developed economy and convenient transportation, reputed as “the land of fish and rice”.
Hangzhou Boda Purity Equipment Co., Ltd., founded in 2002, specializes in R&D and production of gas purifying equipment, pressure swing adsorption equipment and air separation plant. In 2004, our company was awarded National Key High-tech Enterprise. Our company owns an independent provincial R&D center, provides strong guarantee for constant upgrading of new products and new technology, and obtains more than 30 national patents. The product performance reaches the domestic advanced level. Our company always takes technology as power, develops towards “high-quality, professionalism”, makes innovation, cooperates with many research institutes and forms our own scientific research system.
In the tenet of “Pragmatism, Innovation, Sustainable Operation” and modern business philosophy, our company develops entity, expands space, and adheres to the policy of “Market-oriented, Customer-centered”.
In the future, our company will be committed to sustainable development of gas purifying equipment, pressure swing adsorption equipment and air separation plant by virtue of the first-rate quality, advanced technology and satisfactory service, displaying “broadness and profoundness”.