What are the Main Types of Oil Seals?

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Oil seals can be classified from different perspectives: by structure, by function, and by material.

By structure

Skeleton oil seal: composed of a rubber sealing lip, metal skeleton, and spring, commonly used for high-speed rotating shafts.

Single lip oil seal: has only one sealing lip, mainly to prevent lubricant leakage.

Double lip oil seal: adds an auxiliary lip outside the main lip, providing both oil sealing and dust protection.

Labyrinth oil seal: uses multiple channels to block the medium, with low friction, suitable for high-speed environments.

Assembled oil seal: equipped with a metal housing, good heat dissipation, suitable for high-temperature or heavy-duty equipment.

By function

Oil-resistant type: prevents leakage of lubricants or liquid media.

Dust-resistant type: prevents external dust and particles from entering the system.

Pressure-resistant type: suitable for sealing under certain pressure conditions.

High-speed type: low friction coefficient, suitable for high-speed rotating shafts.

By material

Nitrile rubber (NBR): good oil resistance, suitable for general lubrication environments.

Fluororubber (FKM): resistant to high temperature and chemical corrosion, commonly used in automotive engines and chemical equipment.

Polytetrafluoroethylene (PTFE): low friction and corrosion resistance, suitable for high-speed or special media.

Silicone rubber (VMQ): excellent low-temperature resistance, commonly used in cold environments.

Polyurethane (PU): wear-resistant and pressure-resistant, used in construction machinery.

Recommendation After identifying the type of oil seal, enterprises or purchasers should consider key parameters such as operating temperature, pressure, medium, speed, and installation space to make a proper selection. It is advisable to first communicate with suppliers, obtain samples for small-scale testing, and then optimize based on actual service life and sealing performance. This approach ensures reliable equipment operation and reduces maintenance costs.