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1. The greater the spring compression, the better the sealing effect. In fact, if the compression of the spring is too large, it will cause the friction pair to wear sharply and burn out instantly; excessive compression will make the spring lose the ability to adjust the end face of the moving ring, resulting in failure of the seal.

2.严格的密封模式移动ring, the better. In fact, the tightness of the dynamic ring seal is harmful and not beneficial. One is to aggravate the wear and tear between the sealing ring and the shaft sleeve and cause premature leakage; the other is to increase the resistance of the axial adjustment and movement of the moving ring, which cannot be adjusted in time when the working conditions change frequently; the third is that the spring is easily damaged due to excessive fatigue; four It is to deform the moving ring sealing ring and affect the sealing effect.

3. The tighter the static ring seal, the better. The static ring sealing ring is basically in a static state, and the sealing effect will be better if it is relatively tight, but it is also harmful if it is too tight. The first is that the static ring seal is excessively deformed, which affects the sealing effect; the second is that the material of the static ring is mostly graphite, which is generally brittle, and excessive force can easily cause fragmentation; the third is that it is difficult to install and disassemble, and the static ring is easily damaged.

4. The tighter the impeller lock nut, the better. In the mechanical seal leakage, the leakage between the sleeve and the shaft (inter-shaft leakage) is relatively common. It is generally believed that the leakage between the shafts is that the impeller lock nut is not locked tightly. In fact, there are many factors that cause the leakage between the shafts, such as the failure of the pad between the shafts, offset, impurities in the shafts, and large shapes at the joint between the shaft and the sleeve. Position errors, contact surface damage, gaps between parts on the shaft, and excessively long threads on the shaft head will all cause inter-shaft leakage. Excessive locking of the lock nut will only lead to premature failure of the inter-axle pad. On the contrary, moderately lock the lock nut so that the inter-axle pad always maintains a certain compression elasticity. During operation, the lock nut will automatically lock in time to keep the shaft in good condition. sealed state.

5. New is better than old. Relatively speaking, the effect of using a new mechanical seal is better than that of the old one, but when the quality or material of the new mechanical seal is not selected properly, the large size error of the fit will affect the sealing effect; It is better not to replace it if it is worn out. Because the static ring is in a static state for a long time in the static ring seat, the polymer and impurities are deposited as a whole, which plays a better sealing role.

6. It is better to dismantle and repair than not dismantle. Once the mechanical seal leaks, it is eager to dismantle and repair. In fact, sometimes the seal is not damaged, and the leakage can be eliminated by adjusting the working conditions or properly adjusting the seal. This will not only avoid waste, but also verify your own fault judgment ability, accumulate maintenance experience and improve the quality of maintenance.