What are the reasons that can cause mechanical seal leakage?

1. Excessive wear occurs at the sealing surface between the rotating ring and the stationary ring; an unreasonable load coefficient in the design leads to cracks, deformation, and damage of the sealing surface. Therefore, choosing a better brand of construction machinery with meticulous design will reduce the frequency of repairs over time. 2. Several auxiliary sealing rings are defective or have defects resulting from improper installation, and the selected auxiliary sealing rings are not suitable for the working medium. Be careful during assembly. 3. The spring preload is insufficient, or after prolonged operation, the spring may break, corrode, loosen, or become coked; furthermore, suspended particles or crystals from the working medium can accumulate over time and block the gaps in the spring, resulting in the failure of the spring and preventing the compensation seal ring from moving freely, thus causing leaks ； 4. Excessive deviation in the perpendicularity between the sealing surfaces of the rotating and stationary rings and the axis centerline leads to poor adhesion at these sealing surfaces, resulting in leakage ； 5. Due to the large axial movement of the shaft, as well as poor fit or quality of the components related to the sealing area, leaks are likely to occur.

1. Excessive wear occurs at the sealing surface between the rotating ring and the stationary ring; an unreasonable load coefficient in the design leads to cracks, deformation, and damage of the sealing surface. 2. Several auxiliary sealing rings are defective or have defects resulting from improper installation, and the selected auxiliary sealing rings are not suitable for the working medium. 3. The spring preload is insufficient, or after prolonged operation, the spring may break, corrode, loosen, or become coked; furthermore, suspended particles or crystals from the working medium can accumulate over time and block the gaps in the spring, resulting in the failure of the spring and preventing the compensation seal ring from moving freely, thus causing leaks ； 4. Excessive deviation in the perpendicularity between the sealing surfaces of the rotating and stationary rings and the axis centerline leads to poor adhesion at these sealing surfaces, resulting in leakage ； 5. Due to the large axial movement of the shaft, as well as poor fit or quality of the components related to the sealing area, leaks are likely to occur.

Dynamic sealing is generally a sealing technique that combines rigidity and flexibility, using gas-liquid media to form a nearly rigid \"film\" at the interface between the moving and stationary parts; this film reduces leakage to near zero. Among these five elements (rigidity, flexibility, movement, stillness, and membrane), any one or more of them experiencing problems can cause the leakage amount to exceed the limit, resulting in leakage.

Aging of the O-ring, damage to the sealing surfaces of the moving and stationary rings

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The quality of the water used for lubricating the mechanical seal is poor, and there are no measures to prevent scaling. As the temperature of the mechanical seal or the pump body rises during operation, scaling occurs, which increases the friction coefficient between the rotating and stationary rings, leading to damage and leakage of these rings