What is a pressure reducing valve?

A pressure reducing valve (PRV) sits on your incoming mains water line and automatically limits the water pressure flowing into your home. In Klang Valley, mains water pressure can fluctuate significantly, sometimes reaching levels that strain pipes, fixtures, and appliances. A PRV keeps that pressure within a safe operating range, typically between 40 and 80 psi (pounds per square inch), protecting your plumbing system from damage.

Without a PRV, excessive pressure can cause leaks at joints and connections, shorten the lifespan of water heaters and washing machines, and lead to premature failure of valves and seals throughout the house. The valve works by sensing downstream pressure and opening or closing a small internal passage to maintain your set pressure level, even when mains pressure varies.

A PRV is usually installed near the main water meter, typically before any branch lines split off into the home. It requires minimal maintenance but should be checked periodically to ensure it is functioning correctly. If you notice sudden drops in water pressure, unusual hissing from the valve, or persistent drips from the relief port, it may need repair or replacement.

If you need to install or service a PRV, plumbing professionals in Klang Valley can assess your mains pressure and recommend the right valve for your home.