What are the common wear patterns of Repair sealing rings, and how to improve their durability?

Repair sealing ring is a key sealing component in various industrial equipment, mainly used to prevent liquid or gas leakage. Since its working environment is often accompanied by harsh conditions such as high pressure, high speed, vibration and high temperature, wear is one of the most common causes of failure. This article will take an in-depth look at common wear patterns and causes of repair seals, and analyze how to improve their durability through optimized design.

1. Common wear patterns of repair seals
Adhesive Wear
Due to the high contact pressure between the sealing ring and the moving parts, adhesion and tearing can occur on the material surface, leading to adhesive wear. This kind of wear usually occurs when there is insufficient lubrication or high surface roughness.

Abrasive Wear
External particles or impurities enter the sealing area and rub against the surface of the sealing ring, causing the surface material to be scratched. This is one of the most common types of wear on seals in harsh environments, especially in mining, construction and other dusty environments.

Fatigue Wear
Under long-term high-frequency movement, the sealing ring is repeatedly subjected to alternating loads, and cracks will appear on the surface of the material and gradually peel off. This wear usually manifests as localized surface peeling, affecting the overall performance of the seal.

Chemical Erosion
When the sealing ring comes into contact with chemical media (such as acids, alkalis or solvents), the material may be corroded, causing the weakening of the material structure and accelerated wear.

Thermal Degradation
After being exposed to high temperatures for a long time, the sealing ring material will age, harden or crack, and lose elasticity, thereby reducing sealing performance and accelerating wear.

2. Optimize design to improve sealing ring durability
In order to reduce the above-mentioned wear problems, design optimization is a key means to improve the performance and life of the repaired sealing ring. The following optimization methods are widely used:

Material selection optimization

High wear-resistant materials: Choosing materials with excellent wear resistance such as polytetrafluoroethylene (PTFE), fluororubber (FKM) or polyurethane (PU) can significantly reduce adhesion and abrasive wear.
Chemical-resistant materials: In the chemical or petroleum fields, choosing materials with strong resistance to chemical media (such as fluorinated rubber or EPDM) can effectively extend the service life.
Thermal stable materials: In high-temperature applications, use silicone rubber (VMQ) or fluoroelastomer to avoid thermal aging problems.
Surface treatment improvements

Reduce surface roughness: Optimize seal contact surface and reduce roughness to reduce the occurrence of adhesion and abrasive wear.
Coating technology: By coating a low-friction coating (such as PTFE coating) on ​​the surface of the sealing ring, the friction coefficient is reduced and wear is reduced.
Structural design optimization

Multi-lip seal design: The seal ring with multi-lip design can effectively prevent particles and impurities from entering the sealing area, thereby reducing abrasive wear.
Reinforced support ring: Increasing the support structure of the sealing ring can avoid deformation and fatigue wear caused by high pressure.
Lubrication solution improvements

Lubricant selection: Use appropriate lubricants, such as high-performance lubricating oil or grease, to reduce friction and wear between the sealing ring and the contact surface.
Lubrication path optimization: Ensure that lubricant can be evenly distributed to the seal contact area to maximize the lubrication effect.
Management of work environment

Contamination control: In environments prone to abrasive wear, using a tighter dust-proof design or cleaning media can reduce damage to the sealing ring from external particles.
Temperature control: In high-temperature applications, thermal aging problems can be effectively reduced by strengthening the cooling system or selecting high-temperature-resistant materials.