Yu-flexible waterproof casing pipe four wing structure is mainly a ring, of which the top flange is also called pressure Portland, here are three wings ring. Produced by standard flexible waterproof casing. Generally ring-wing pressure and thickness of the top flange is consistent. Pressure is greater than the width of the blue wing of the top ring. Smaller than the inner diameter of the single wing ring. But their outer diameter is the same, slightly larger than the outer diameter of the pressure flange. We recommend that you purchase flexible waterproof casing, try to use the national standard, do not be tempted by cheap non-standard. Non-standard sleeve outer diameter and thickness are irregular, the market there is no uniform non-standard specifications. Also on the standard flexible waterproof casing longer produced, and generally unified caliber casing is DN350, but due to different uses now standard engineering requirements are different, such as high-rise buildings is used DN350 what caliber, if not greater than 350mm factory production in advance so On the supply is not too abundant to custom processing, extended or increased according to requirements engineering, but is still used in the production of standard 02S404 atlas made. High-rise building with flexible waterproof casing standard wall pipe is generally used 02s312 standard, allowing the pipeline have passed achieve airtight effect. 02s404 peripheral Dayong large water conservancy majority. In fact, regardless of which standard is institute Atlas data. So that customers can purchase according to project needs its own project using appropriate criteria may be. Use of high-rise buildings caliber 250mm - 350mm, A-type, GB. Water pressure through a small cannula, no strict standards. Some do not even have water, no special materials, as long as there is a sealing device fixed pipeline. Material Q235 steel processing, seamless steel tubes welded. Yu-can meet a variety of projects with a waterproof casing welcome to order. The news and information from the Yu-Water Equipment Co. engineer finishing release from http://www.gyycgd.com/, For selections, please indicate the origin address!