A pressure-vacuum breaker (PVB) protects your home’s drinking water from contamination by automatically blocking backflow if the water main loses pressure. It uses a spring-loaded check valve and an air-inlet valve that opens to let air in if upstream pressure drops, breaking any siphon that could pull dirty water back into the supply.
How it protects the supply
- Spring-loaded check valve allows flow only one direction
- Air-inlet valve opens when pressure drops upstream
- Air entering the line breaks any siphon
- Required on irrigation systems and certain commercial uses
PVBs are required by code on lawn irrigation in nearly every Washington jurisdiction. We install, test, repair, and replace through our PVB service, plus full backflow prevention programs.
