Stainless steel flange is a kind of disk-shaped parts, which is the most common in pipeline engineering. Flanges are used in pairs and with the matching flange on the valve. In pipeline engineering, flange is mainly used for pipeline connection. In the need to connect the pipeline, all kinds of installation of a flange, low-pressure pipeline can use thread flange, 4 kg pressure above the use of welding flange. Add a gasket between the two flange plates, and then fasten them with bolts. Flange with different pressure has different thickness and use different pressure Bolt.
Pumps and valves, when connected with the pipeline, the local parts of these equipment are also made into the corresponding flange shape, also known as flange connection. All the connecting parts which are connected by bolts in two planes and closed at the same time are generally called “flange”, such as the connection of ventilation pipes. This kind of parts can be called “flange parts”. But this kind of connection is only a part of the equipment, such as the connection between the flange and the water pump, it is not good to call the water pump “flange parts”. Relatively small, such as valves, can be called “flange parts”.
Gasket is a kind of ring which can produce plastic deformation and has a certain strength. Most of the gaskets are cut from non-metallic sheet, or made by professional factories according to the specified size, and the materials are asbestos rubber sheet, asbestos sheet, polyethylene sheet, etc; It can also use thin metal sheet (white iron sheet, stainless steel) to wrap asbestos and other non-metallic materials to make metal wrapped gasket;
There is also a kind of spiral wound gasket made of thin steel belt and asbestos belt. The ordinary rubber gasket is suitable for the temperature lower than 120 ℃; Asbestos rubber gasket is suitable for water vapor temperature lower than 450 ℃, oil temperature lower than 350 ℃, pressure lower than 5MPa occasions, for general corrosive media, the most commonly used is acid resistant asbestos board. In high-pressure equipment and pipelines, lens type or other shape metal gaskets made of copper, aluminum, 10 steel and stainless steel are used. The contact width between high pressure gasket and sealing surface is very narrow (line contact), and the machining finish of sealing surface and gasket is high.
