How to properly replace, install, and remove valve flange gaskets

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How to properly replace and install valve flange gaskets: When working with new pipes or replacing existing ones, the first step is to remove and install the flange gaskets. This article covers the steps for removing the valve flange and the tools required for the removal. It also provides some information on how to properly replace and install valve flange gaskets. Replacing the flange gasket requires following these basic principles: prepare the necessary materials and tools, pay attention to the operational steps, and meet the technical requirements and installation guidelines. Preparation: (Tools necessary for flange installation and removal) 1. Materials: butter, cotton yarn, leak detection fluid, sealing gaskets. 2. Tools: adjustable wrench, screwdriver, pipe wrench, socket set. Operation steps: (Note: Before removing the pipeline, make sure that the pressures on the upstream and downstream sides have been released, and that the pipeline is not in operation.) ) 1. Remove the flange connection bolts, take off the valve, or remove the leaking pipe section. Remove the old gasket from the sealing surface. Select the appropriate gasket and apply a even layer of butter to both sides. Careful handling is required during installation to prevent damage to the flange. After completion, the tools should be cleaned and maintained. 2. Place the gasket on the sealing surface between the two flanges, align it with the centers of the flanges and the bolt holes, insert the bolts, tighten the nuts, and tighten them evenly in several steps in a diagonal manner. It is advisable for the bolt to extend 2-3 pitches beyond the nut. After the flange gasket is installed, it must pass a pressure test at operating pressure with no leaks to be considered qualified. Technical requirements and key points for gasket installation: 1. Proper selection: The type, material, and size of the flange, bolts, and gaskets should be chosen appropriately based on the operating conditions and the structure of the flange surface, so that installation can be carried out without issues. 2. Thorough inspection: Before installation, the quality of flanges, bolts, nuts, and gaskets should be carefully checked; there should be no defects such as burrs, uneven surfaces, or cracks. Carefully inspect the flanges and pipe installations; there should be no misalignment, incorrect fitting, or wrong hole positioning. 3. Thorough cleaning: The flange sealing surface must be cleaned thoroughly; bolts and gaskets must not contain any impurities or oil residues. Proper installation: The gasket should be concentric with the pipe or fitting. Even application of force: When installing bolts and nuts, apply force evenly, tightening them in multiple stages in a symmetrical manner.