The service life of rubber seals cannot be accurately specified in years or hours. It has a lot to do with the conditions of use, the material of the seal, the quality of the seal, the installation groove, the installation method, and the storage of the seal.
1. Seal material:
(1) To select a suitable seal material, pay attention to the adaptability of the material to the working temperature and the compatibility with the oil.
(2) The material and surface processing accuracy of the relative moving parts of the seal have an impact on the seal. The surface roughness value of the relatively moving surface is small, which has a good effect on prolonging the service life.
(3) The lubrication state should be good.
(4) To prevent dust and sand from mixing.
(5) Lubricating oil should be clean.
2. Seal life:
(1) The service life of the seal depends on its working conditions and environmental conditions. at any stage during the life of the seal. The operating conditions, both in motion and at rest, must be suitable for the selected conditions. For example, a seal made of polyurethane rubber is afraid that the oil will contain water, and if it encounters water, it will deteriorate and become inelastic. Another example is the seal made of nitrile oil-resistant rubber. When the oil temperature exceeds the allowable range, the life of the oil temperature will be reduced by 50% if the oil temperature rises by 15 °C.
(2) Seals used in short-stroke mechanisms or hydraulic components can be calculated according to the number of actions, generally 150,000 to 250,000 times.
(3) The seals used in long-stroke hydraulic cylinders can be calculated according to the movement mileage, mainly 100-1500 km.
(4) The seals used for static sealing can be calculated according to the actual service time, mostly 15,000-20,000 hours or 1.5-2 years.
3. Storage of seals
1. The seal is a consumable part, and spare parts are usually required.
2. Seals are prone to natural aging. The actual service life of rubber seals should be equal to the sum of the storage period and the working period. To extend the working life, it is necessary to shorten the storage period of the product from manufacture to use. Storage and delivery time, so that the seal can play its role to the maximum.
3. The seal should avoid being placed in places with high room temperature, direct sunlight, humidity, and air convection.
4. The seals are not allowed to be stacked or hung to avoid permanent deformation.
5. The year and month of manufacture of the seal should be recorded on the packaging bag, and issued and used within the storage period.
6. Put the seal into a polyethylene bag, and store it in a dark and cool place after sealing.
7. Check and deal with the seals that exceed the storage period, and those that do not meet the quality requirements should be scrapped.
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