Pressure-balancing valves are devices used in plumbing systems to maintain a consistent water pressure, ensuring a steady flow from faucets and showerheads. They work by automatically adjusting the flow of hot and cold water, preventing sudden temperature changes that can occur when other fixtures are used simultaneously. These valves are particularly important for safety, as they help prevent scalding by keeping the water temperature stable. When the pressure of either hot or cold water fluctuates, the valve compensates, allowing for a comfortable and safe experience while using water fixtures like showers and sinks.