Mechanical seal is one of the most effective ways to seal the rotating mechanical body. The machining accuracy of the mechanical seal is relatively high, especially the dynamic and static rings. If the disassembly and assembly methods are not suitable or used properly, the assembled mechanical seal not only can not reach the sealed Purpose, but also damage the assembly of the sealing element. 1, Disassembly precautions 1) When removing the mechanical seal, it is forbidden to use hand hammer and flat shovel to avoid damaging the sealing element. 2) If there is a mechanical seal on both ends of the pump, care must be taken in the disassembly process to prevent loss. 3) Working mechanical seal, sealing surface if the gland is loose mobile case, you should replace the dynamic and static ring parts, should not be re-tighten the continued use. Because after loosening, friction original vice orbit will change, the contact surface of the seal can easily be destroyed. 4) If the sealing element is fouled or agglomerated, remove the condensate and then remove the mechanical seal. 2, Precautions during installation 1) Before installation, it is necessary to carefully check whether the number of assembled sealing parts is sufficient, whether the components are damaged, in particular whether there is any bump, crack or deformation on the moving ring or static ring. If there is a problem, repair or replacement of new spare parts is required. 2) check the sleeve or gland chamfer is appropriate, if not meet the requirements must be trimmed. 3) mechanical seal components and their assembly contact surface, must be cleaned with acetone or anhydrous alcohol before installation. During the installation process should be kept clean, especially moving, stationary ring and auxiliary sealing elements should be free of impurities, dust. Dynamic and static ring surface coated with a layer of clean oil or turbine oil. 4) Gland should be carried out after the coupling is corrected. Bolt should be tightened evenly, to prevent the gland section deflection, with feeler or special tools to check the points, the error is not greater than 0.05 mm. 5) Check the gland and shaft or sleeve diameter with the gap (and concentricity), we must ensure that the surrounding uniform, with a feeler to check the tolerance of not more than 0.10 mm. 6) The amount of spring compression to be carried out according to the regulations, not allowed to have too large or too small, requiring error ± 2.00 mm, over the General Assembly to increase the section pressure, accelerate section wear. Too small will cause the pressure is insufficient and can not play the role of seal, the spring installed in the spring seat to move flexible. With a single spring to pay attention to the direction of rotation of the spring, the rotation of the spring should be the opposite direction of rotation of the shaft. 7) The moving ring should be kept flexible after installation, and it should be able to automatically rebound when the moving ring is pressed against the spring. 8) The static ring seal set in the back of the static ring, and then into the sealed end cap. Pay attention to protect the static ring cross-section, to ensure the static ring cross-section perpendicular to the centerline of the end cap, and anti-rotation groove on the back of the static ring alignment anti-rotation pin, but do not make them contact with each other. 9) During the installation process, the sealing element must not be struck directly by the tool. When it is needed to be beat, it must be struck with a special tool to prevent the sealing element from being damaged.
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