The problem about the Flat welding flange has been a topic of concern. It is related to the company and the production cost of enterprises or economic benefits and other issues, so the sealing principle on flange in continuous improvement and perfect.

However, the main disadvantage of design of flange is that it can not guarantee no leakage. This is less than its design: the connection is dynamic, and such as thermal expansion and fluctuating cycle load will cause the movement between the flange and the flange of the influence function, so that the integrity of the flange damage, resulting in leakage. Any product can not be without flaws, just try to control the shortage of products to a minimum, so the company in the production of flange to improve product performance, make it play the biggest role.

Flat welding flange Features: flange not only saves space, reduces the weight, the more important is to ensure that the joints do not leak, has good sealing performance. The reason for the reduction in the size of the compact flange is that the diameter of the seal is reduced, which will reduce the cross section of the sealing surface. Secondly, the flange gasket has been replaced by the seal ring to ensure that the sealing face matching face. This way, in order to compress the sealing surface requires only a small pressure. With the reduction of the required pressure, the size of the bolt and the required number can be reduced accordingly, so the design of a small size and light weight (compared to the traditional flange weight reduction of 80% ~ 70%) of the new products. Therefore, a relatively flat welding flange flange high-quality products, reducing the quality and space, which plays an important role for industrial use.

Flat welding flange Sealing principle: the two sealing surfaces of the bolt are pressed to each other and form a seal, but this also leads to the destruction of the seal. In order to keep the seal, you have to maintain a huge bolt force, to this end, the bolt will do even greater. A bigger bolt nut must match the larger, which means that the larger diameter bolts need to create conditions for the tightening nut. However, the greater the diameter of the bolt, the flange will become more curved, the only way is to increase the thickness of the flange part of the flange. The whole device will require a great deal of size and weight, which is a special issue in the offshore environment, because in this case the weight is always the main problem that people have to pay attention to. But, fundamentally, flange is an invalid seal, it needs to take 50% of the bolt load for gasket extrusion, while maintaining pressure on the load for only 50%.