05/21/2026
💧 There's a small but mighty device in your home working 24/7 to keep your pipes from bursting — and most people have no idea it's there. It's called a PRV (Pressure Reducing Valve), and in a city like San Francisco — where street water pressure can swing wildly due to all those hills — it's doing a lot more work than you might think. Strange knocking sounds, uneven water pressure, or visible corrosion near your main line? That could be your PRV telling you something. We broke down how it works and what warning signs to watch for.
Local plumbing expert Ace Plumbing & Rooter explains what is inside a pressure reducing valve and why they fail (and what you should know).