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Submerged pump seal also known as the mechanical seal, which has a pair of perpendicular to the axis of rotation of the end surface of the submerged pump in the fluid pressure and compensate mechanical external elastic force under the effect of submerged pump rely on secondary seal with the other end to keep fit And slide relatively to prevent fluid leakage. Underwater pump mechanical seal more common causes of submerged pump leakage. Mechanical seal itself is a high precision parts, the design, machining, assembly quality has high requirements. In the use of submerged pump mechanical seal, the mechanical seal should be analyzed using a variety of factors, the mechanical seal for a variety of submerged pump technical requirements and the use of media requirements and adequate lubrication conditions, so as to ensure long-term reliable seal Run. Submerged pump mechanical seal still exists in the design, selection, installation, etc. not reasonable place. (1) liquid pump spring compression must be carried out according to the regulations, not allowed to have too large or too small, the error ± 2mm, the compression is too large to increase the end pressure, friction heat too much, resulting in liquid pump sealing surface Thermal deformation and accelerated wear on the face, the amount of compression is too small ring than the end of the pressure is not enough, you can not seal. (2) The end face of the shaft (or sleeve) for installing the submerged pump ring seal and the seal gland (or shell) for installing the static ring seal should be chamfered and light-edged so as not to touch the static and dynamic ring Sealing ring. Liquid pump mechanical seal itself is a higher precision parts, the design, machining, assembly quality has high requirements. In the use of mechanical seals, liquid pumps should be analyzed using a variety of mechanical seal of the various factors that make the mechanical seal liquid pump for a variety of submerged pump technical requirements and the use of media requirements and adequate lubrication conditions, in order to ensure the liquid Under the pump seal long-term and reliable operation.