Which type of valve would NOT be applicable for flow regulation?

The correct choice is the type of valve that is not used for flow regulation, which is often referred to as a fractional valve. Unlike gate, globe, or ball valves, fractional valves are typically designed for specific uses, often related to precise measurement or control in a specific application rather than the regulation of flow.

Gate valves are primarily designed to be fully open or fully closed, providing minimal resistance to flow when open but not suitable for adjusting or throttling flow. Globe valves, on the other hand, are designed specifically for flow regulation due to their shape, allowing for better control of flow and pressure within a system. Ball valves also excel in flow regulation when used in throttling applications, as they allow for a range of flow control.

In contrast, the purpose of a fractional valve does not align with the fundamental requirement for flow regulation. Therefore, it is not applicable for use in scenarios needing precise flow control. This distinction is crucial for anyone working with various types of valves in utilities and maintenance.