Where is Test Cock # 2 located on a PVB?

In a Pressure Vacuum Breaker (PVB) assembly, Test Cock #2 is specifically positioned after the check valve and before the air inlet valve. This arrangement is crucial because it allows for accurate testing of the backflow prevention device. By placing Test Cock #2 in this location, it facilitates the assessment of the performance of the check valve and verifies that it is functioning properly to prevent backflow into the potable water system.

The placement is designed so that during testing, you can observe the operation of the check valve under specific conditions. This is vital for ensuring that the system is maintaining pressure correctly and that no contaminants can siphon back into the clean water supply. The air inlet valve is integral to the operation of the PVB, allowing air to enter the system when needed to avoid vacuum conditions that could lead to backflow.

Understanding the configuration of the PVB and the roles of its components assists in maintaining and verifying backflow prevention measures effectively, crucial for safeguarding water quality.