California ICC UST Inspector Practice Exam

Which of the following is NOT a suggested operation or maintenance checklist item for ball float valves?

1. Ensure that the air hole is not plugged

2. Make sure that the cage is intact

3. Make sure that the ball seats tightly

4. Make sure that the ball-float valve initiates an overfill alarm

The correct answer is: Make sure that the ball-float valve initiates an overfill alarm

The reason why the identification of a ball-float valve initiating an overfill alarm is not typically included in a recommended operation or maintenance checklist is rooted in the specific function of the ball-float valve itself. Ball-float valves are primarily designed to control the flow of liquid and prevent overfilling by closing off the flow when the liquid reaches a certain level. While ensuring the valve operates properly is critical, the function of initiating an overfill alarm typically pertains to a separate system or mechanism that monitors fluid levels. The other items in the checklist are directly related to the operational integrity and mechanical reliability of the ball-float valve itself. Ensuring that the air hole is not plugged is crucial for the valve to function correctly, as this impacts the pressure dynamics that allow the valve to open and close. Making sure that the cage is intact ensures the structure surrounding the ball mechanism is not compromised, which could lead to improper functioning or failure. Likewise, confirming that the ball seats tightly is essential for preventing leaks and ensuring the valve can effectively stop the flow when it should. Each of these tasks directly supports the primary purpose of the valve, making them appropriate for a maintenance checklist.