What is a pressure reducing valve?

A pressure reducing valve (PRV) is a control device mounted on your home's main water supply line, typically near the meter or where water enters the house. It automatically reduces the pressure of incoming municipal water to a lower, safer level for your plumbing system.

Municipal water systems often deliver water at pressures between 50 and 150 PSI (pounds per square inch). Most residential plumbing fixtures and pipes are designed to handle 40 to 80 PSI safely. Without a PRV, excessively high pressure can cause damage over time, including leaks in pipe joints, broken water heater relief valves, and premature wear on faucets and appliances.

The valve works by sensing downstream pressure and opening or closing a diaphragm to maintain a preset pressure level. When incoming pressure exceeds the valve's setting, it opens slightly to allow excess water to bypass, keeping downstream pressure constant. This protects your entire plumbing system and extends the life of fixtures and appliances that use water.

If you notice sudden leaks, persistent dripping faucets, or unusual noise in your pipes, a malfunctioning PRV or excessive water pressure may be the culprit. A qualified plumber in Aiken can test your water pressure and install or repair a PRV if needed.