Black Seal High Pressure License Practice Exam

A globe valve is designed primarily for throttling and regulating flow, which means that it has a much more complex flow path compared to a gate valve. When the fluid passes through a globe valve, it experiences more turbulence and a higher velocity change due to the valve's internal structure. The globe valve allows for finely tuned control of flow but introduces more resistance to the fluid movement, leading to a reduction in flow rate compared to a gate valve, which is designed for full flow either in the open or closed position.

On the other hand, a gate valve, when fully opened, provides a straight-through passage that minimizes resistance and allows for maximum flow rates. The direct opening of a gate valve means that it does not significantly obstruct the flow, resulting in higher flow rates when compared to a globe valve. Thus, when looking at the impact on water flow, particularly in applications where regulation and throttling are not the main concern, a globe valve typically leads to a slower flow rate. This characteristic solidifies the choice that a globe valve has a slower flow rate than a gate valve.

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