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RPBA - 2 check valves (right) and one pressure relief valve (left)
What is Backflow?
What is Backflow?
Backflow is the undesirable reversal of the flow of water or mixtures of water and other substances back into the potable water supply. This can occur when there is a sudden drop in water pressure in the supply line or when there is an increase in pressure downstream of the supply line, causing the water to flow in the opposite direction. Backflow can contaminate the clean water supply with substances from sources such as irrigation systems, fire sprinkler systems, or even chemicals stored near plumbing fixtures.
Two Types of Backflow
Two Types of Backflow
Backpressure and backsiphonage the two types of backflow, posing health risks by allowing contaminants into clean water supplies.
Backpressure occurs when downstream pressure exceeds supply pressure, forcing water in the reverse direction. For instance, high-pressure irrigation systems can push water back into drinking supplies without proper prevention devices.
Backsiphonage happens when a sudden drop in supply pressure creates a vacuum, pulling water from downstream into the supply line. This could occur during a water main break, contaminating the plumbing system.
Preventive measures, like check valves and vacuum breakers, are crucial to protect water supplies from such contamination. Regular testing and maintenance are essential for these devices to function effectively.
Reduced Pressure Principle Backflow Preventer
How do Backflow Prevention Assemblies work?
How do Backflow Prevention Assemblies work?
Backflow prevention assemblies are mechanical devices installed in plumbing systems to prevent the backward flow of contaminated water into the clean water supply.
Check valves are crucial components, allowing water to flow in one direction while preventing reverse flow. These valves incorporate a flap or gate that opens with forward water flow but closes to block any backflow.
Vacuum breakers are also pivotal, intervening to introduce air into the plumbing system when pressure drops occur. By breaking the siphon effect, vacuum breakers prevent contaminated water from being siphoned back into the clean water supply.
Both check valves and vacuum breakers are integral in ensuring the integrity and safety of plumbing systems.
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