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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. Thermostatic and pressure balanced mixing valves help to further regulate water temperatures in places 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.