Flat welding flanges have poor rigidity and are suitable for situations with pressure p ≤ 4MPa; Welding flanges, also known as high neck flanges, have high rigidity and are suitable for applications with high pressure and temperature. There are three types of flange sealing surfaces: flat sealing surfaces, suitable for situations with low pressure and non-toxic media; High and low sealing surfaces, suitable for situations with slightly higher pressure; Mortise and tenon sealing surface, suitable for flammable, explosive, toxic media and high-pressure environments.
Flat welding flange gasket is a circular ring made of material that can undergo plastic deformation and has a certain strength. Most gaskets are cut from non-metallic plates or made by professional factories according to regular sizes, with materials such as asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc; Metal gaskets made by wrapping non-metallic materials such as asbestos with thin metal plates (such as white iron sheet or stainless steel) are also used.
Ordinary rubber gaskets are suitable for situations where the temperature is below 120 ℃; Asbestos rubber gasket is suitable for situations where the temperature of water vapor is below 450 ℃, the temperature of oil is below 350 ℃, and the pressure is below 5MPa. For general corrosive media, acid resistant asbestos board is the most commonly used. According to the connected components, it can be divided into container flanges and pipe flanges. According to the structural style, there are full flange, loose flange, and threaded flange. Common types of flanges include flat welding flanges and butt welding flanges.
Flat welding flanges are easy to use and can withstand high pressure. In industrial pipelines, flange connections are widely used. In the home, the diameter of the pipeline is small and it is low-pressure, so flange connections cannot be seen. If in a boiler room or production site, there are pipes and components connected by flanges everywhere.
