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Oil Seal (245)

Oil seals are designed to fit on valves and pipes in order to seal oil inside the required compartments. They perform two important functions: they keep the oil from escaping, allowing it to do its job of reducing friction and wear of machine parts without needing to be constantly replenished, and they keep foreign contaminants from entering and ruining the oil. While they are referred to as "oil seals," they are used to hold any fluid inside a particular device, especially if it has moving parts. This is especially true for hydraulic systems.

Oil seals can be used in many different situations. Some may be placed inside machines in moving rods that need to have a seal as they move along their shafts. Others are used externally, such as piston seals that are exposed to other elements and need to keep contaminants from reaching the oil as well as keep the oil from escaping. Some seals are made to perform equally well both internally and externally.

V-ring Seals
V-ring seals have two different sections of rubber, divided into a thick base and thinner flap that extends out forming a right angle space between the two pieces. When the seal is placed on a pipe, the outer flap bends in, contracting a forming a tighter v-shape with the base rubber section. They are easy to install and do not need a perfect fit to perform well, but can only withstand so much pressure before breaking or wearing apart.

Labyrinth seals
Labyrinth seals are wide seals created with many parallel grooves carved into the rubber, in effect creating a series of more   simple seals designed to fit inside a shaft. This creates a tight maze that obstructs the oil from escaping, since leaks that make it past the first part are usually stopped later on by another groove of the seal. These seals are especially common in rotating mechanisms, where the rod needs to turn inside the shaft.

Spring-installed versions
Many oil seals also include a thin spring next to the rubber. This spring is designed to force the rubber against the metal it forms that seal with, ensuring a stronger barrier against the oil. Springs create much stronger seals, but they also cause the rubber to wear away more quickly.