A double mechanical seal has two primary seals with a barrier or buffer fluid area in between. Each primary seal typically consists of a softer, narrower stationary face accompanied by a harder, wider rotating face. A double mechanical seal consists of two seals arranged in a series. The inboard, or “primary seal†keeps the product contained within the pump housing. The outboard, or “secondary seal†prevents the flush liquid from leaking into the atmosphere. Two rotating seal rings are arranged facing away from each other.
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