When testing a double check valve assembly, which gauge reading would indicate a check valve failure?

When testing a double check valve assembly, which gauge reading would indicate a check valve failure?

• A. Less than 0.5 PSID
• B. Equal to 1.0 PSID
• C. More than 1.0 PSID
• D. Less than 1.0 PSID

Answer: (D)

When testing a double check valve assembly, a gauge reading of less than 1.0 PSID indicates a potential check valve failure. In a functioning double check valve, the pressure differential should normally be greater than 1.0 PSID, which signifies that the check valves are holding properly and preventing backflow. When the reading falls below this threshold, it suggests that there is a drop in the pressure differential, often due to one or both check valves failing to seal correctly. This failure allows water to flow back into the potable water supply, which poses a risk of contamination. Therefore, a reading under 1.0 PSID serves as a crucial diagnostic indicator of malfunctioning check valves, thereby highlighting the need for further inspection or maintenance of the valve assembly.

When testing a double check valve assembly, a gauge reading of less than 1.0 PSID indicates a potential check valve failure. In a functioning double check valve, the pressure differential should normally be greater than 1.0 PSID, which signifies that the check valves are holding properly and preventing backflow.

When the reading falls below this threshold, it suggests that there is a drop in the pressure differential, often due to one or both check valves failing to seal correctly. This failure allows water to flow back into the potable water supply, which poses a risk of contamination. Therefore, a reading under 1.0 PSID serves as a crucial diagnostic indicator of malfunctioning check valves, thereby highlighting the need for further inspection or maintenance of the valve assembly.