Pressure vacuum breaker
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A Pressure Vacuum Breaker (PVB) is a backflow prevention device, similar to an atmospheric vacuum breaker (AVB), except that the PVB contains a spring-loaded poppet and may be used on high hazard applications and may have valves installed downstream. Pressure vacuum breakers must be protected from freezing when installed outdoors. PVBs usually have test cocks so that they may be tested with specially-calibrated test gauges to insure that they are functioning properly
[edit] See also
- Air gap
- Hydrostatic loop
- Double check valve
- Chemigation valve
- Reduced Pressure Principle BFP
- Atmospheric vacuum breaker
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