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What are the causes and solutions for rotary seal seal failures?

Update:01-04-2022
Summary:

There are many reasons for the failure of rotary dynami […]

There are many reasons for the failure of rotary dynamic seal seals. ZHEJIANG JIACHENG NEW MATERIAL CO., LTD. tells you that the following common problems are the most common reasons:

First, the causes and solutions of too many leaks:
1. The installation of the rotary seal is incorrect. If the seal is installed properly, do not install it in reverse or move it, which can solve the difficulty of too much leakage;
2. If the pressure of the sealing lip of the rotary seal is insufficient (such as: frame seal), it is necessary to check whether the product specifications of the seal are appropriate, and check whether the spring is working normally;
3. The unevenness of the shaft may also lead to the leakage of sealing chemicals. The solution is to reduce the roughness of the shaft, or choose a softer seal product or other seal material;
4. The sealing lip and palate of the seal is cleft, resulting in the exposure of sealing chemicals from the gap. The reason for the cracking of the sealing lip and palate is likely to be due to the uneven surface of the shaft, or the use of incorrect sealing materials or the speed and temperature are too high. As a result, the problem can be solved if the seal product suitable for the working conditions is selected;
5. Seal damage: disassemble the seal product and improve the wear resistance of the seal.

 

Second, the reasons and solutions for the excessive friction between the seal and the sealing surface:
1. The friction caused by the lubrication in the middle of the seal and the sealing surface is too large. If it is possible to allow the replacement of a PTFE seal product, the self-lubrication can be improved and the frictional force of the friction surface can be reduced;
2. The preload is too large. In this case, it can be solved if the seal type is replaced;
3. Frictional resistance caused by excessive pressure in the working environment. In this case, the sealing type must be designed from a new scheme.

 

Third, the damage causes and solutions of seals:
1. When the seal is installed, due to improper installation or loss, the seal is damaged before it is used, and the expected sealing effect cannot be guaranteed. Therefore, we should install the seal properly and use common tools appropriately;
2. There are grinding particles in the sealing environment (or the shaft is damaged). In dusty working environment, everyone must also use a dust ring for the sealing part.

 

Fourth, the reasons and solutions for the damage of the seals:
1. The reason for the excessive damage may be the seal type or the wrong selection of the seal material. Before selecting the seal, we must use a more suitable seal according to the specifications of the working environment;
2. The high pressure in the working environment is one of the reasons that the seal is too damaged. The solution is to form a seal that is more suitable for the available type according to the working environment specification;
3. The temperature of the working environment is too high, causing the seal to be hardened and damaged too much. We want to use more suitable high temperature seal products according to the specifications of the working environment.

 

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