Because the bearing housing is closed off to atmospheric pressure, this pressure,in the form of expanded air, needs some place to go. The seals of the bearing housing are made to withstand small amounts of pressure. By using an expansion chamber, you are providing a place for this expanded air to go, causing the seal not to breathe. If the seal were allowed to breathe contaminants could get into the system.

Posted in: Expansion Chambers, Opto-Matic Closed System Oiler, Watchdog Oiler

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