When should a pressure-reducing valve be installed?

A pressure-reducing valve (PRV) is typically installed after the main isolation valve to effectively manage and reduce the pressure of water coming into a building from the municipal water supply or well. This placement is crucial because the main isolation valve serves as the primary control point for the entire water supply system of the building. By installing the PRV after this valve, it ensures that the pressure is regulated for the entire plumbing system, providing consistent water pressure to all fixtures and appliances while protecting them from potential damage caused by high pressure.

When the PRV is positioned in this way, it also makes maintenance and adjustments easier, as access to the valve is straightforward and allows for proper functioning without interruption of service throughout the building. Installing the PRV at this location helps maintain optimal performance of plumbing fixtures and appliances, reducing wear and tear and ensuring a longer lifespan for the system.