Bearing isolators are permanent bearing protection device. It comprises a ring and a stationary ring, two combined into one, so the two do not separate during operation. Ring rotate together with the shaft, stationary ring fixed to the bearing housing is press-fitted. Ring and stationary ring cooperate with each other to prevent outside impurities from entering the bearing housing, and to prevent lubricant leakage. The best performance bearing isolator is made of metal, typically copper, a combination of water vapor blocking function (Vapor-blocking), equipment downtime during cooling to prevent ambient water vapor entering the bearing housing.
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