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1. Prevent Leakage By creating a tight seal around the shaft, oil seals effectively prevent lubricants from leaking out, which is essential for the efficient operation of machines.

The typical construction of a skeleton oil seal includes an outer casing that fits snugly into the housing, a sealing lip that makes contact with the rotating shaft, and a metallic reinforcement that provides rigidity. This combination of materials ensures that the seal is capable of handling the dynamic conditions of machinery while maintaining an effective barrier against the ingress of dirt and the egress of lubricants.

3. Increased Operating Pressure A change in the pressure gauge reading can signify a seal issue. If the pressure is fluctuating unexpectedly, it may be due to fluid bypassing the seals.

- Backup Rings Used to prevent the extrusion of the primary seals under high pressure, backup rings enhance the efficacy of rod and piston seals.