BACKFLOW & PLUMBING SOLUTIONS INC
CA This article is about backflow in plumbing. For backflow in the circulatory system (AKA reflux) · see regurgitation (circulation) . For various other types of biological backflow · 1 ] · a toilet flush cistern and its water supply must be isolated from the toilet bowl. For this reason · either back pressure or back siphonage . [ · Back pressure is the result of a higher pressure in the system than in its supply · 2 ] · Category 1: No risk. Potable water Category 2: Aesthetic quality affected · e.g. water which may have been heated Category 3: Slight hazard from substances of low toxicity · e.g. cold water storage tanks Category 4: Significant hazard · e.g. pesticides Category 5: Serious health risk · according to the hazard. Category 2 contamination may be prevented by a single check valve · but category 3 requires a double check valve (these are manufactured as a convenient single unit · or even integrated into tap (faucet) fittings). Category 5 requires an air gap · not merely a valve. A recent introduction to the UK has been the Reduced Pressure Zone (RPZ) valve · a form of double check valve where the intervening zone is drained and normally kept empty. [ · If the downstream valve leaks and permits backflow · requiring certified installation and annual checks. They are used for category 4 systems · such as provided by a tundish (a combined overflow spout and catch funnel) or a large gap · 3 ]
BUFORD, GA 30519
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