Cangzhou Bohai Tube Co. specializing in the production of 20 # flange welded flange sliding flange: sliding flange has a low hub because the pipe before entering the single flange welding. This is welded inside and outside provide sufficient strength to prevent leakage. Marine sliding flange 20 # flanges are bored slightly larger outside diameter of the pipe is superior to match their neck flange welding, due to the lower initial cost 20 # flanges, many users set loose 20 # flange, But probably not the final installation costs than the less because the increase in weld neck flanges. Cangzhou Bohai Tube Co. specializing in the production of 20 # flange Blind Blind appearance, generally divided into flat plate Blind, 8-word blind plate, flapper, and the grommet (flapper and grommet blind pass each other) . Edit this section folding production process is generally divided into four types: forging, casting and forging, plate cutting, casting. Highest price which forged the American standard 20 # flange, plate, followed by casting and forging a minimum. The casting is a process most of the times. The quality is good and the board of forging, casting and forging to be somewhat less. Flat welding flange 20 #, 20 # flanges, Cangzhou Bohai Ltd. Cangzhou Bohai provided by tube. Flat welding flange 20 #, 20 # flanges, Cangzhou Cangzhou Bohai Bohai Pipe Fittings Co., Ltd. (www.czbh628.com) launched this new upgrade, the above picture is for reference only, please call the contact page or image on this phone obtain the latest information, contact: Zhangsong Wei.