Large diameter flange is one kind of flange. It is widely used and promoted in the machinery industry. The use of the range according to different characteristics to determine the more moderate conditions for the media. For example, low-pressure non-purification of compressed air, low-pressure circulating water, it has the advantage of cheaper prices. Coil flanges are suitable for steel pipe connections with nominal pressures not exceeding 2.5 MPa. The sealing surface of the rolling flange can make in smooth type, smooth type rolling flange application. The other two ways of rolling flange in use is also more common.

Large diameter flanges are cut into lath with medium plate and then roll into circles. Reprocessing waterline, bolt holes, etc. This is generally a large flange, can do 7 meters. The raw material is medium plate, good density. Large diameter flange material has carbon steel, stainless steel, alloy steel, etc.

There are three types of large diameter flange sealing surface:

  1. Plane sealing surface, suitable for the occasion of low pressure and non-toxic medium.
  2. Concave and convex sealing surface, suitable for the occasion of slightly higher pressure.
  3. Tenon sealing surface, suitable for flammable, explosive, toxic medium and high pressure occasions.

The quality process of large diameter flange is as follows:

Large diameter flange to take the use of different processes to produce large flanges have their own advantages and disadvantages. For the production in the plate, the joint position of the most critical processing. If this position welding leakage will occur. For the large diameter flange forged, there will be a layer of skin after the flange finished. If the bolt hole just hit the position of the skin, it will appear leakage phenomenon when has pressure. We use the above quality process to produce flange, correct operation to produce a good product.