Oil Seals 101 – The Ultimate Guide | Dechengwang

Oil seals work by squeezing and retaining lubricant in a thin layer between the lip and the shaft. Perfect sealing is ensured by the hydrodynamic action of the rotating shaft, which in turn produces a slight pump action.

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As earlier said, oil seals perform some functions that ensure the functionality of mechanical equipment and extend their lifespan. And how they do this is by retaining lubricants at all cost and not making them escape no matter how high the pressure of the machine is.

The other way oil seals work is by stopping outboard materials that can damage the machine or contaminate its lubricant. The outboard materials that the oil seal will need to stop depend on the application. However, the most common kinds are dirt, moisture, and the particles produced during manufacturing.

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Standard petroleum oil has a lifespan of 30 years at 86 degrees Fahrenheit if it&#;s not 

contaminated with moisture or any other particle. But the same oil will only last for a month at 212 degrees Fahrenheit if it&#;s contaminated with little water. This is why the function of an oil seal is very evident whenever it&#;s used.

Proper mechanical seal selection can lead to a better mechanical seal. The chemical resistance of all the wetted seal components must be looked at the three general materials the metal component, the secondary seal and the primary seal phases.

The metal component like spring, gland and sleeve holder must be investigated for the proper corrosion resistance because this is critical with thin metal parts such as metal bellow and springs.

The secondary mechanical seal will work well when the elastomer bellow works well and all it&#;s temperatures elastomer subject to too high a temperature will compression set or high harden leading seal failure chemical attack can cause an incorrectly selected elastomer to become stick or swollen and lose its physical properties.

Material selection is the mechanical seal face are the material acceptable in the concentrations and temperature of product that they seal for instance corban may be attacked by strong oxidizing chemical like nitric and sulfuric acid at certain concentration and temperature make sure the face material are constructed of pure unfild materials otherwise binder and fillers can be attacked as well.

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