Effect of gasket on tightness of flange

Effect of gasket on tightness of flange

The bolt flange connection is composed of a pair of flanges, a number of bolts, nuts and a gasket. The flange is sealed by tightening the bolt and pressing the gasket.

However, the sealing performance of the flange depends on the following factors. For example, bolt preload, flange stiffness and bolt stiffness, the influence of operating conditions and the influence of gaskets.

The following mainly analyzes the effect of gasket on the sealing performance of flange

Gasket is an important component to ensure sealing. The suitable gasket material can make the gasket produce the necessary elastic deformation under the appropriate preload force, and will not be crushed or squeezed out; When working, the bolt is stretched under the action of internal pressure, so that the gap between the sealing surface of the flange is increased, and the gasket material should have enough springback ability to keep the gasket surface in close contact with the flange surface to continue to maintain good sealing performance; When selecting gasket materials, the working medium and working temperature should also be considered.

The width of the gasket is also an important factor affecting the sealing, the wider the gasket, the greater the required pre-loading force, so the size of the bolt and flange is also required. However, if the gasket width is too narrow, it may be crushed due to overload, resulting in connection failure.