The Specific Performance of Flange Gaskets

You must understand the specific performance of flange gaskets!

We all know that there are small components that play a sealing role together in flange connections. They are gaskets. During normal use, flange gaskets may be affected by media, temperature, pressure, etc. However, many people are not familiar with the specific performance of different gaskets. Today, we will briefly introduce the performance of several types of flange gaskets.

1. Flange metal gaskets
The flange metal gasket can be divided into three forms: octagonal and elliptical gaskets, toothed gaskets, and lens gaskets, which are made of materials such as pure iron, extremely soft steel, and aluminum. The metal gasket has high requirements for the machining accuracy and surface roughness of the sealing surface, and its bolt clamping force is large, making it more suitable for use in valves under high temperature and pressure.

The flange metal gasket we mentioned at the beginning is suitable for different places. Octagonal and elliptical flange gaskets are suitable for use in A-type clamp butterfly valves with trapezoidal groove flange sealing surfaces. The tooth form is actually an improvement on the metal flat gasket, processing a conical tooth ripple to make it suitable for use on concave convex flange sealing surfaces. The lens gasket is self-evident and is actually a type of gasket suitable for sealing surfaces of lens type flanges.

2. Flange graphite gaskets
The biggest characteristic of graphite is its softness, so gaskets made of graphite are often used in high-temperature and highly corrosive media.

3. Flange metal clad graphite gaskets
The flange metal wrapped graphite gasket and flange graphite gasket are different, so when choosing a suitable one, you must pay attention. The flange metal wrapped graphite gasket is made of thin metal wrapped around the annular asbestos gasket, which is more suitable for use in high temperature and high pressure environments.

The above is the specific characteristics and scope of use of three different types of flange gaskets that I have summarized for you today. In fact, in addition to the three types of flange gaskets we introduced today, there are many other types of gaskets. For example, spiral wound gaskets are suitable for high temperature and medium pressure valves, and PTFE gaskets are suitable for low temperature and strong corrosive media under various pressures.

What material is the flange gasket made of and how should it be selected?

What material is the flange gasket made of and how should it be selected? We all know that the flange gasket is an important tool for sealing between flanges. If the flange is not sealed properly during installation, it will inevitably affect the use of pipe fittings or equipment.

The flange gasket is usually a circular ring shape, and the material used to make the gasket has great strength and can produce plastic deformation, such as asbestos rubber board, asbestos board, PTFE board, polyethylene board, and other materials. These gasket materials are also commonly seen on the market, mostly cut directly from non-metallic plates, but there are also professional factories that specialize in making them according to specific dimensions. In addition, there is another type of flange gaskets that is made by wrapping non-metallic materials such as asbestos with a thin metal plate. Of course, there is also a type of spiral wound gaskets that is not wrapped, but is made by winding thin steel strips and asbestos strips together. However, the most commonly used type of spiral wound gaskets is still the one made by winding stainless steel strips and graphite.

The flange gasket made of different materials is actually designed to meet the needs of different equipment and fittings. The selection of gaskets is influenced by the requirements of the equipment itself and the environmental temperature of the equipment and fittings used.

If the temperature of your pipe fittings and equipment is below 120 ℃, just use a regular gasket. If the water vapor temperature is higher during equipment use, but not higher than 450 ℃, asbestos rubber gaskets can be selected. If the gasket is used for oil and the temperature is below 350 ℃ and the pressure is below 5MPa. It is recommended to use acid resistant asbestos board. Stainless steel metal gaskets should be used in high-pressure pipelines and equipment.

Gaskets are an important component in flange connections, and when selecting them, it is important to make a reasonable selection based on the equipment and pipelines installed on the flange, as well as the environment in which they are used.

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