Minnesota Boiler License Practice Exam

On a globe valve used on feed piping, the inlet shall be:

1. Immaterial

2. Above the valve disc

3. Under the valve disc

4. At the side of the valve

The correct answer is: Under the valve disc

The correct answer highlights a critical aspect of the design and operation of a globe valve in feed piping applications. In a globe valve, the flow of the fluid enters underneath the valve disc. This design is significant for a couple of reasons. Firstly, when the fluid enters below the disc, it mitigates turbulence and enhances control over the flow. This positioning allows the valve to better manage the flow direction and pressure during operation, contributing to more stable performance. Secondly, this configuration aids in providing a better sealing mechanism when the valve is closed. The flow under the disc helps to push the disc against the seat, creating a tighter seal and reducing the likelihood of leaks. This aspect is particularly important in feed piping, where maintaining proper pressure and preventing leaks is crucial for safety and efficiency. When considering the other options: - An immaterial inlet doesn't provide any guidance for installation or operation, leaving impracticality in real-world applications. - Placement above the valve disc would disrupt flow control and could lead to significant pressure losses and inefficiencies. - An inlet at the side of the valve might not provide optimal flow characteristics or sealing performance compared to an inlet beneath the disc. Thus, understanding the positioning of the inlet relative to the valve disc in globe valves