Selection of gaskets

Gaskets are widely used in the static sealing of joint surfaces of pipes, pressure vessels and various housings. There are three types of gaskets: non-metallic gaskets, non-metal and metal gaskets, and metal gaskets. Its common materials are rubber, leather, asbestos, cork, PTFE, steel, iron, copper and stainless steel.

Leakage of gaskets has three forms: interface leakage, leakage leakage, and destructive leakage. Among them, the former two are the main forms.

Sealing pad selection:

The principle of selection of gaskets is that, where the requirements are not high, they can be selected based on experience and replaced when they are not available. However, for those demanding applications, such as explosives, highly toxic and flammable gases, and highly corrosive liquid equipment, reaction tanks and conveying pipe systems, etc., they should be sealed according to working pressure, working temperature, and temperature.

The effect of flange surface roughness. Flange surface roughness has a great influence on the sealing effect, especially when a non-soft gasket is used, the high degree of roughness of the sealing surface is one of the main causes of leakage. For example, when turning a flange surface, the knife pattern is a spiral. When a metal gasket is used, if the roughness value is large, the gasket cannot block the spiral groove formed by the knife pattern. Under pressure, the medium will be Follow this groove and leak it out. Soft gaskets require much less cleanliness of the flange surface because it is easily deformed and can block the cutting patterns and prevent leakage. For soft gaskets, the flange surface is too smooth and unfavorable.