Dielectric unions, withdielectricinsulation, separate dissimilar metals (such as copper and galvanized steel) to preventgalvanic corrosion. When two dissimilar metals are in contact with an electrically conductive solution (ordinary tap water is conductive), they form an electrochemical couple which generates a voltage byelectrolysis. When the metals are in direct contact with each other, theelectric currentfrom one to the other also moves metallicionsfrom one to the other; this dissolves one metal, depositing it on the other. A dielectric union breaks the electrical path with a plastic liner between its halves, limiting galvanic corrosion.
Rotary unionsallow mechanicalrotationof one of the joined parts, while resisting leakage.
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