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A pressure balance shower valve addresses temperature flux only due to inlet pressure changes. The internal mechanism is designed to maintain water temperature despite pressure fluctuations in the hot andr cold supply. As an example, when someone flushes the toilet it will not cause the water temperature in the shower to suddenly get too hot. A pressure balance shower valve addresses temperature flux only due to inlet pressure changes. The internal mechanism is designed to maintain water temperature despite pressure fluctuations in the hot andr cold supply. As an example, when someone flushes the toilet it will not cause the water temperature in the shower to suddenly get too hot. The pressure balance valve does not sense the actual temperature of the water, just the ratio of hot and cold water supplied to the valve.