Retains lubricant: It prevents lubricant, such as oil or grease, from leaking out of the machine where it’s needed for smooth operation.
Excludes contaminants: It stops dirt, water, or other environmental contaminants from entering the machinery, protecting the shaft and internal components from damage.
Single lip rotary shaft oil seals are commonly found in:
They are typically made from a combination of materials:
Sealing lips: These are the parts that come into contact with the shaft and are usually made from a synthetic rubber material, such as nitrile rubber (NBR) or fluoroelastomer (FKM), also known as Viton. These materials are chosen for their wear resistance and good sealing properties.
Metal casing: This provides strength and rigidity to the seal and is typically made from stamped steel.
Spring: This keeps the sealing lip in constant contact with the shaft, ensuring an effective seal.
When choosing a single lip rotary shaft oil seal, it is important to consider the following factors:
Shaft size: The seal must have the correct inner diameter to fit snugly on the shaft.
Housing size: The seal must also have the correct outer diameter to fit properly in the housing.
Material: The seal material should be compatible with the lubricant and operating temperature.
Operating speed: Some seals are designed for specific speed ranges.
Chemical resistance: If the seal will be exposed to chemicals, the material should be resistant to those chemicals.