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Rob243
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I am scratching my head on this question. PRV is supposed to create a closed system requiring a thermal expansion tank. But at the same time PRV is not considered a backflow preventer. How can both be true?
A pressure reducing valve is designed to regulate the flow of water in a plumbing system, ensuring that the pressure remains within a safe range. However, it does not have the ability to prevent backflow. Backflow occurs when water flows in the opposite direction, from the point of use back into the main water supply. This can happen due to changes in pressure or a malfunction in the plumbing system.
No, a pressure reducing valve cannot completely shut off the flow of water. Its purpose is to regulate the pressure, not stop it entirely. Additionally, closing off the flow of water can create other problems in the plumbing system, such as causing pipes to burst.
Yes, there are other devices specifically designed to prevent backflow, such as backflow preventers. These devices use a mechanism to only allow water to flow in one direction, preventing any backflow from occurring. It is important to have a backflow preventer installed in areas where the risk of backflow is high, such as in industrial or irrigation systems.
Yes, a pressure reducing valve can malfunction and cause backflow. This can happen if the valve is not properly maintained or if it becomes damaged. It is important to regularly check and replace pressure reducing valves if necessary to prevent any malfunctions that could lead to backflow.
Yes, backflow can also be caused by a sudden change in pressure in the main water supply, such as during a water main break or a firefighting event. It can also occur if there is a cross-connection between the main water supply and a contaminated source, such as a garden hose submerged in a pool. Properly installed and maintained backflow preventers can help protect against these potential causes of backflow.