What does a gauge reading decrease after closing the number 1 shut off valve on an SVB indicate?

What does a gauge reading decrease after closing the number 1 shut off valve on an SVB indicate?

• A. The system is under positive pressure
• B. The number 2 shut off valve leaks with demand
• C. No leaks are present in the system
• D. The site tubes are clogged

Answer: (B)

A decrease in the gauge reading after closing the number 1 shut-off valve on a system with a shut-off valve indicates a possible issue with the second valve. This is because the closure of the first valve is expected to isolate the area, and if there is a decrease in pressure afterward, it suggests that the second shut-off valve is not completely sealing off the flow. Instead, it is allowing water to pass through, which can occur due to wear, debris, or any damage that causes it to leak. This scenario implies that the system is losing pressure because fluid is still moving, despite the attempt to isolate the system by closing the number 1 valve. Therefore, an observed pressure drop is a strong indication of a leak at the number 2 shut-off valve, reflecting a failure to maintain the expected pressure levels, which would remain stable if there were no leaks present in the system.

A decrease in the gauge reading after closing the number 1 shut-off valve on a system with a shut-off valve indicates a possible issue with the second valve. This is because the closure of the first valve is expected to isolate the area, and if there is a decrease in pressure afterward, it suggests that the second shut-off valve is not completely sealing off the flow. Instead, it is allowing water to pass through, which can occur due to wear, debris, or any damage that causes it to leak.

This scenario implies that the system is losing pressure because fluid is still moving, despite the attempt to isolate the system by closing the number 1 valve. Therefore, an observed pressure drop is a strong indication of a leak at the number 2 shut-off valve, reflecting a failure to maintain the expected pressure levels, which would remain stable if there were no leaks present in the system.