In the propylene-glycol-water loop, an expansion tank is necessary to prevent a system failure that could occur when the fluid expands. As you know, liquids expand when they are heated, and they are not compressible; the expansion tank provides room for the hot fluid.

Because temperatures may be hotter than desired, a tempering valve automatically adds cold water as needed to set the final output temperature.

The expansion tank has an enclosed air chamber that is separated from the circulating fluid with a bladder that expands and contracts as the fluid temperature changes.

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