What is the function of a pressure-reducing valve?

The function of a pressure-reducing valve is to lower and stabilize incoming water pressure. This is crucial in plumbing systems where the incoming water pressure from the municipal supply can be too high, potentially causing damage to pipes, fixtures, and appliances. By reducing the pressure to a safer and more manageable level, the valve helps protect the integrity of the plumbing system and ensures a consistent flow of water.

Moreover, maintaining a stable pressure improves the efficiency of water delivery throughout the home or building, allowing for optimal function of faucets, showers, and appliances that require water. In addition, a stable pressure can prevent issues such as leaks and water wastage, which can occur when pressure is excessively high.

The other choices present functions that do not align with the primary purpose of a pressure-reducing valve. For instance, increasing pressure, regulating sewage flow, or filtering contaminants are separate functions that are handled by different components within a plumbing system.