Definitions for "Pressure Vacuum Breaker"
Keywords:  backflow, downstream, spring, avb, pvb
See backflow preventer.
A type of device used to prevent backflow in a water distribution system that consists of a spring loaded check valve, an independently operating air inlet valve, two resilient seated shutoff valves, and two resilient seated test cocks.
a backflow prevention device incorporating the use of a spring loaded seat for positive sealing to protect domestic water from possibly contaminated irrigation water.