- Seal is the most basic and most important device to ensure the normal operation of the hydraulic system. Most of the leakage in the hydraulic and pneumatic systems is caused by the failure of the seal. The performance and reliability of seals and sealing devices are important indicators of system design and manufacturing quality.
- If the sealing is improper, it will cause internal and external leakage of components and systems, which will not only reduce the volumetric efficiency of the system, but also cause the system to fail to work because the pressure cannot be established in severe cases, and external leakage will also pollute the environment. Therefore, the correct use of seals is very important to ensure the normal operation of the hydraulic system.
- The basic requirements of hydraulic system for seals:
- 1. Hydraulic oil has good stability, that is, the volume change is small, the expansion and shrinkage rate is small, it is not easy to dissolve, and it will not cause changes in hardness; when the temperature changes within the range of use, the changes in elasticity and hardness are small;
- 2. It has good sealing performance and suitable elasticity, and has large compression recovery in hydraulic oil and small permanent deformation;
- 3. Good wear resistance, small friction coefficient, flexible movement and long working life;
- 4. Simple structure, easy to process, use and maintain.