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Basics to know about, pressure balancing valve/mixer.

Ever taken a shower that was perfectly adjusted for the right temperature, only to have someone somewhere else in the house turn on a tap or flush the toilet and completely mess up the perfect temperature shower? A pressure balance valve is a sophisticated plumbing device that reacts to changes in the pressure of the delivery water. Typically, both hot and cold water sources are fed into a pressure balance valve, and its job is to ensure that the volume of water that leaves the pressure balance valve is a constant mix of these two sources, even if the delivery pressure of the two sources changes.

Drastic changes in water temperature in the shower can be dangerous. There have been cases of the water temperature changing from normal to scalding hot and causing minor burns. Temperature extremes in the other direction have also caused problems, with people slipping and falling trying to avoid a suddenly very cold shower. These problems are exacerbated when very young or very old people are involved.

In older homes, a pressure balance valve may not work very well if there is an inadequate flow of water due to clogged water pipes or poor water pressure due to the age of the plumbing system.


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