The sealing principle of flange is mainly achieved through the pre-tightening force of bolts. When the bolts are tightened, sufficient pressure will be generated between the flange and the gasket to deform the surface of the gasket, thereby filling the microscopic unevenness of the flange sealing surface and achieving the sealing effect. In the initial sealing stage, the surface plastic deformation of the gasket plays a decisive role in filling the microscopic unevenness of the flange sealing surface; while in the operating state, the sealing of the flange is mainly guaranteed by the elastic recovery inside the gasket.
The sealing performance of the flange is affected by many factors. First, the stiffness of the flange directly affects its sealing performance. If the stiffness of the flange is insufficient, it may lead to poor sealing. Secondly, defects and shape and size deviations generated during machining will also cause gaps, thereby affecting the sealing effect. In addition, the pressure difference on both sides of the sealing area will also affect the leakage of the medium.
In order to ensure the sealing effect of the flange, it is necessary to reasonably select and use sealing gaskets. The selection of gaskets should take into account factors such as its material, thickness and hardness to ensure that sufficient tightening force and resilience can be provided under the operating pressure. At the same time, it is also necessary to regularly check and maintain the status of the flange connections to prevent leakage problems caused by looseness or other damage.
