Because Rialto sits on sloping foothills between the mountains and the valley, City of Rialto municipal water mains operate at very high pressures—frequently reaching 90 to 140 PSI in the street to push water uphill.
The Purpose of Your Bell-Shaped PRV Valve
Located on your main line near the front hose bib, the brass bell-shaped Pressure Reducing Valve (PRV) reduces incoming 120 PSI city pressure down to a safe residential range of 55 to 70 PSI.
Signs Your PRV Has Failed
- Banging Pipes ("Water Hammer"): Loud thumping sounds in walls when faucets are turned off quickly.
- Constantly Running Toilets: High pressure forces water past toilet fill valves.
- Spurting Faucets: Faucets blasting high-pressure blasts when opened.
Left uncorrected, high water pressure causes premature copper pinhole slab leaks and ruptured appliance hoses. Our plumbers test and replace failing PRVs.