While field testing the number 1 check valve of a double check, if water continues to flow from the site tube, what is the likely cause?

While field testing the number 1 check valve of a double check, if water continues to flow from the site tube, what is the likely cause?

• A. Shut off valve #1 is leaking
• B. Check valve #2 is faulty
• C. Shut off valve #2 is leaking
• D. Test gauge is malfunctioning

Answer: (A)

When testing the number 1 check valve of a double check assembly, the appearance of continued water flow from the site tube indicates that the first check valve is not properly sealing. This is often a result of a malfunctioning shut-off valve, specifically the one associated with the first check valve. If shut-off valve #1 is leaking, water pressure may allow flow past the first check valve, leading to the observation of water leaking from the site tube. The function of the check valves in a double check assembly is to prevent backflow, and if any shut-off valve leaks, it compromises the integrity of that system. In this scenario, the leaking shut-off valve allows water to bypass the check valve, indicating that it is not functioning effectively. Thus, the issue is consistent with the behavior you would expect when the first shut-off valve is leaking, supporting the conclusion that option A is the correct answer.

When testing the number 1 check valve of a double check assembly, the appearance of continued water flow from the site tube indicates that the first check valve is not properly sealing. This is often a result of a malfunctioning shut-off valve, specifically the one associated with the first check valve. If shut-off valve #1 is leaking, water pressure may allow flow past the first check valve, leading to the observation of water leaking from the site tube.

The function of the check valves in a double check assembly is to prevent backflow, and if any shut-off valve leaks, it compromises the integrity of that system. In this scenario, the leaking shut-off valve allows water to bypass the check valve, indicating that it is not functioning effectively.

Thus, the issue is consistent with the behavior you would expect when the first shut-off valve is leaking, supporting the conclusion that option A is the correct answer.