What is the minimum pressure requirement for the relief valve spring?

The minimum pressure requirement for the relief valve spring is important because it ensures that the relief valve operates effectively to prevent backflow and maintain proper system pressure. A relief valve typically needs to be set at a specified minimum pressure to function correctly, allowing it to open and relieve excess pressure while preventing contaminants from entering the drinkable water supply.

In this case, the correct answer indicates that the minimum pressure required is 2.0 psi. This value is established based on safety and functionality standards in backflow prevention systems, ensuring that the valve activates before critical thresholds are reached where potential backflow incidents might occur. Meeting this pressure requirement is essential for the reliability of the backflow prevention device and helps ensure safe drinking water by helping to mitigate risks associated with backpressure and backsiphonage.

Understanding this minimum pressure helps maintenance personnel and operators of water systems ensure that the equipment is well-maintained and functioning to safeguard public health.