The greater the spring compression volume, the better the sealing effect. In fact, excessive compression of the spring can lead to sharp wear of the friction pair and instantaneous burning; excessive compression makes the spring lose the ability to adjust the end surface of the moving ring, leading to seal failure.

　　The tighter the moving ring ring, the better. In fact, the moving ring sealing ring is too tight and not harmful. First, aggravate the wear between the sealing ring and the shaft sleeve, premature leakage; second, the force increases the resistance of the axial adjustment and movement of the moving ring, which cannot be adjusted when the working condition changes frequently; third, the spring is excessively tired and easily damaged; fourth, the moving ring is deformed, which affects the sealing effect.

　　The tighter the static ring sealing ring, the better. The static ring sealing ring is basically in a static state, and the relatively tight sealing effect will be better, but too tight is also harmful. First, it causes the excessive deformation of the static ring seal, affecting the sealing effect; second, the static ring material is mostly graphite, generally brittle, excessive force can easily cause fragmentation; third, it is difficult to install and remove, easy to damage the static ring.

　　The tighter the impeller will lock the mother, the better. In mechanical seal leakage, leakage between shaft (leakage between shaft) is relatively common. It is generally believed that the leakage between the shaft is the impeller lock mother is not locked, in fact, there are many factors leading to the leakage between the shaft, such as the failure of the shaft pad, offset, impurities between the shaft, the shape between the shaft and the shape error, the contact surface damage, the gap between the parts on the shaft, the shaft thread is too long will lead to the leakage between the shaft. Excessive lock lock will only lead to the premature failure of the shaft pad, on the contrary, moderate lock lock, so that the shaft pad always maintain a certain compression elasticity, in the operation of the lock will automatically timely lock, so that the shaft is always in a good sealing state.

　　The new is better than the old. Relatively speaking, the effect of using the new mechanical seal is better than the old, but the quality or material selection of the new mechanical seal is larger, will affect the sealing effect; in the polymerization and permeability medium, static ring without excessive wear, or not replaced. 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 one, which plays a better sealing role.

　　Repair is better than nothing. Once there is a mechanical seal leakage will be eager to remove and repair, in fact, sometimes the seal is not damaged, only need to adjust the working condition or properly adjust the seal can eliminate the leakage. In this way, waste can verify their own fault judgment ability, accumulate maintenance experience to improve maintenance quality.