Product Introduction

Principle and characteristics of flat welding flange

The issue of flat welding flanges has always been a topic of concern for people, as it relates to the production costs or economic benefits of companies and enterprises. Therefore, the sealing principle of flat welding flanges is constantly being improved and perfected.
However, the main design disadvantage of flat welding flanges is that they cannot guarantee no leakage. This is its design deficiency: the connection is dynamic, and cyclic loads such as thermal expansion and fluctuations can cause movement between flange faces, affecting the function of the flange and damaging its integrity, leading to leakage. No product can be without defects, it's just trying to minimize the shortcomings of the product. Therefore, when producing flat welding flanges, the company strives to improve the performance of the product and make it play its role.

The characteristics of flat welding flanges: Flat welding flanges not only save space and reduce weight, but more importantly, ensure that the joint does not leak and have good sealing performance. The reason for the reduction in compact flange size is due to the decrease in the diameter of the seal, which will reduce the cross-section of the sealing surface. Secondly, the flange gasket has been replaced by a sealing ring to ensure that the sealing surface matches the sealing surface. In this way, only a small amount of pressure is required to tighten the sealing surface. As the required pressure decreases, the size and quantity of bolts can be correspondingly reduced, so a new product with small volume and light weight (70% to 80% lighter than traditional flanges) has been designed. Therefore, the flat welding flange type is a relatively good flange product that reduces weight and space, playing an important role in industrial applications.
The sealing principle of flat welding flange: The two sealing surfaces of the bolt squeeze the flange gasket and form a seal, but this also leads to the destruction of the seal. In order to maintain sealing, a huge bolt force must be maintained, and for this reason, the bolts need to be made larger. And larger bolts need to be matched with larger nuts, which means that larger diameter bolts are needed to create conditions for tightening nuts. However, the larger the diameter of the bolt, the more bent the applicable flange will become, and the solution is to increase the wall thickness of the flange part. The size and weight required for the entire device become a problem in offshore environments, as weight remains a major concern for people in such situations. Moreover, fundamentally speaking, flat welding flanges are an ineffective seal that requires 50% of the bolt load to be used to compress the gasket, while only 50% of the load used to maintain pressure remains.