Working principle and characteristics of flat welding flange

The characteristics of the flat welding flange: the flat welding flange not only saves space and reduces weight, but more importantly, it ensures that the joints will not leak and has excellent sealing performance. The reduction in the compact flange standard is due to the reduced diameter of the seal, which will reduce the cross-section of the sealing face.

Affect the function of the flange, thereby compromising the integrity of the flange, eventually causing a leak. It is impossible for any product to be free of defects, but to minimize the lack of products as much as possible, so the company tries to improve the performance of the product when manufacturing flat welding flanges, so that it can play the greatest role.

However, the main design disadvantage of the flat welding flange is that it cannot guarantee no leakage. This is its design deficiency: the connection is dynamic, and such as thermal expansion and fluctuating cyclic loads will all cause movement between the flange faces.

And a bigger bolt will match a bigger nut, which means that a bolt with a larger diameter is required to create conditions for tightening the nut. However, the larger the diameter of the bolt, the more curved the useful flange will be. The only way is to increase the wall thickness of the flange part.

Second, the flange gasket has been replaced by a sealing ring to ensure that the sealing faces match the sealing surface. In this way, only a small amount of pressure is required to press close to the cover. As the required pressure decreases, the size and required number of bolts can be reduced accordingly. The sealing principle of the flat welding flange: the two sealing surfaces of the bolt squeeze the flange gasket against each other to form a seal, but this also causes damage to the seal. In order to maintain the seal, a huge bolt force must be maintained, and for this reason, the bolt will be made bigger.