Reducing your risk of liability is just one benefit of proper water pressure balancing. Pressure-balancing maintains your guest's selected shower temperature by instantly and continuously balancing the hot and cold water systems pressure for changes made by other water users. An equal hot and cold pressure supply moves the piston in the shower valve to its center position, allowing equal flow of both hot and cold water. When pressure in the cold water supply drops, the piston moves to the cold end, reducing the opening for the hot water supply.
Temperature remains constant.
When pressure in the hot water supply drops, the piston moves toward the hot end, reducing the opening for the cold water supply. Again, Temperature remains constant. In the event of a cold water supply failure, the piston moves to the extreme position on the cold end, which cuts the hot water supply completely. All water flow through the valve is shut off.