Visual Testing (VT) Practice Exam

Which inspection would be included in a visual examination of a swing check valve?

1. Examination of the hinge pin

2. Examination for wear on the disc

3. Examination for wear on the seat

4. All of the above

The correct answer is: All of the above

In a visual examination of a swing check valve, it is essential to analyze various components to ensure the valve's proper functioning. Each of the inspections mentioned plays a critical role in assessing the valve's condition and efficiency. The examination of the hinge pin is important as it is a pivotal component that allows the disc to rotate and close or open based on flow direction. If the hinge pin is worn or damaged, it could affect the operation of the valve, potentially leading to failure. Similarly, inspecting the disc for wear is crucial, as the disc must create a seal to prevent backflow. Any wear could compromise its ability to close properly, which can result in leaks and reduced system efficiency. Lastly, examining the seat is equally vital because the seat provides a surface for the disc to seal against. Wear on the seat can prevent proper sealing, which can also lead to unintended flow through the valve when it should be closed. Considering all these factors, a comprehensive inspection should involve evaluation of the hinge pin, disc, and seat, making the inclusion of all these inspections a necessity to ensure the swing check valve operates effectively. Therefore, the choice that includes all these components accurately reflects what should be assessed during a visual inspection.