Backflow prevention device
From Wikipedia, the free encyclopedia
A backflow prevention device is used to protect water supplies from contamination. Many types of backflow devices also have ports so that they can be tested or examined to ensure that they are functioning properly. A check valve is a common form of backflow preventer.
Backflow prevention protects the potable water system from from minor, moderate, and severe hazards. There are over 10,000 reported cases of backflow contamination each year. Some cases can be fatal. Backflow devices are required by law where needed and must be installed in accordance with plumbing code. A backflow assembly has test cocks and shut-off valves and must be tested each year, if relocated or repaired, and when installed.
[edit] Partial list of some backflow prevention devices
- Air gap
- Atmospheric vacuum breaker (AVB)
- Chemigation valve (primarily used in agriculture)
- Check valve
- Double check valve, or double check valve assembly (DCVA)
- Pressure vacuum breaker assembly (PVB)
- Reduced Pressure Backflow Prevention Assembly (RP), or reduced pressure principle assembly
- Reduced pressure zone device (RPZ)
[edit] External links
- IAPMO
- Drinking Water & Backflow Prevention magazine
- ICC
- ASSE
- United States Patent 7,033,163 - Backflow prevention device
- The American Backflow Prevention Association
