Groove and Tongue Flanges are a type of pipe fitting that connects the pipeline to various equipment and valves. These flanges are used to disassemble joints and are installed in a tube. By connecting multiple valves and pumps that can be used for cleaning, inspection, and modification, these flanges aid in the construction of a piping system. Groove and Tongue Flanges can be welded or screwed together. These joints are flanged by bolting two flanges together and sealing them with a gasket in between. Groove and tongue flanges have a raised ring called the tongue that is machined into the flange face and has a depression known as a groove.
Source: https://www.ng-steel.com/groove-tongue-flanges-manufacturer-supplier/
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