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Thermostatic and pressure balanced mixing valves help to further regulate water temperatures in placed like the bathroom shower. These valves mix hot and cold water to ensure a near constant temperature and pressure of the water output from the fixture. Fluctuation from variations in both the temperature and pressure of the incoming water supplies is mediated by these devices. == Pressure Balanced Mixing Valve ==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. == Thermostatic Mixing Valve == A thermostatic control valve prevents high output temperature regardless of input and outlet variations and demand variations.