For precise control of flow rate, which valve is preferred?

The globe valve is preferred for precise control of flow rate because of its design, which allows for greater throttling capabilities. The globe valve consists of a movable disk that can be raised and lowered to vary the flow area, providing fine control over fluid flow. This design minimizes turbulence and pressure drop when the valve is partially open, making it highly effective for applications requiring accurate regulation of flow.

In contrast, other types of valves such as check valves automatically prevent backflow and do not offer adjustable flow control. Butterfly valves, while capable of regulating flow, are generally better suited for quick on/off service rather than precise adjustments. Gate valves are designed primarily for full flow and are not intended for throttling; they work best when fully open or closed and do not provide the same level of control as globe valves. Hence, for applications where exact flow regulation is crucial, the globe valve stands out as the best choice.