Backflow Prevention Practice Exam

If the shut-off valve of a backflow assembly is closed, what might be the consequence?

1. Increased back pressure

2. Lack of flow

3. Leakage

4. Contamination of water supply

The correct answer is: Increased back pressure

When the shut-off valve of a backflow assembly is closed, it creates a situation where the normal flow of water is obstructed. This blockage can lead to increased back pressure within the system. Back pressure occurs when water flow is pushed back against its intended direction, which can happen due to various factors, including the shut-off valve being closed. In a properly functioning backflow prevention assembly, the shut-off valves are designed to manage water flow and maintain system integrity. If they are closed, the pressure buildup can potentially lead to other issues, such as ruptures or system failures if the pressure exceeds acceptable levels. While this situation can also cause a lack of flow or potentially lead to leakage and contamination risks, the primary and immediate consequence of closing the shut-off valve is this increase in pressure, highlighting the importance of proper maintenance and operation of backflow prevention systems.