The bypass around a regulating valve should contain a ___________ valve.

In a refrigeration system, a bypass around a regulating valve serves a specific purpose: it allows for the flow of refrigerant to continue when the main regulating valve is closed or in a throttling position. The type of valve used in the bypass is critical to ensuring proper flow characteristics and ease of operation.

A globe valve is particularly suited for use in this context because it is designed for throttling flow. Its design allows for fine control over the flow rate, which makes it ideal for regulating and balancing the flow within the system. The structure of a globe valve, characterized by a spherical body and a movable plug-type disk, allows for precise adjustments and control of the flow, thus ensuring that when the main valve restricts flow, the bypass can still effectively maintain system pressure and protect equipment.

In contrast, a gate valve is primarily designed for on/off control without the ability to regulate flow, making it unsuitable for applications where flow control is necessary. A needle valve, although it provides fine control, is typically used in applications requiring very low flow rates and may not handle higher flow rates effectively. A butterfly valve, while useful for applications requiring quick shut-off, is generally not as effective for precise flow regulation as a globe valve.

Thus, the correct option of