Carbon Steel Cast Iron Flange Blind Plate DN20/25/32/40-200 Support Non-Standard Customized Cover Plate GB DN20 11mm

Also called flanges or flanges. A part that connects pipes to pipes. Connected to the pipe end. There are holes in the flange, which can be threaded with bolts, so that the two flanges are connected. Gasket seals between flanges. Flanged pipe fittings refer to pipe fittings with flanges (edges or plates). It may be cast, threaded or welded. Flange joint is composed of a pair of flange, a flange and a number of bolts and nuts. The gasket is placed between the two flange sealing surfaces, and after tightening the nut, the specific pressure on the surface of the gasket is deformed after reaching a certain value, and the uneven place on the sealing surface is filled, so that the connection is tight without leakage. Flange connection is a detachable connection. According to the connected parts can be divided into container flange and pipe flange. According to the structure, there are integral flanges, looping flanges and threaded flanges.

Common integral flange has flat welding flange and butt welding flange. Flat welding flange rigidity is poor, suitable for pressure P ≤4MPa occasions; Butt welding flange, also known as high neck flange, is more rigid, suitable for high pressure and temperature occasions. There are three types of flange sealing surface: plane sealing surface, suitable for pressure is not high, non-toxic media occasions; Concave and convex sealing surface, suitable for slightly higher pressure occasions; Tenon groove sealing surface, suitable for flammable, explosive, toxic medium and high pressure occasions. Gasket is a kind of ring which can produce plastic deformation and has a certain strength. Most of the gaskets are cut down from non-metallic plates, or made by professional factories in accordance with the specified size, its materials are asbestos rubber sheets, asbestos sheets, polyethylene sheets, etc. Also useful thin metal plate (iron sheet, stainless steel) asbestos and other non-metallic materials wrapped up made of metal gasket; There is also a winding gasket made of thin steel tape and asbestos tape wound together. Ordinary rubber gasket is suitable for the occasion of temperature below 120℃; Asbestos rubber gasket is suitable for water vapor temperature is less than 450℃, oil temperature is less than 350℃, pressure is less than 5MPa occasions, for the general corrosive medium, the most commonly used is acid resistant asbestos plate. In high pressure equipment and pipelines, the use of copper, aluminum, no. 10 steel, stainless steel made of lens type or other shape of metal gaskets. The contact width of high-pressure gasket and sealing surface is very narrow (linear contact), and the processing finish of sealing surface and gasket is high.