A butterfly valve is a type of valve used to regulate flow in a pipeline. It consists of a disc, which rotates on a shaft, to either complete the block or allow flow through the valve. While it can be used for control applications, it is not always considered a control valve.
Control valves are designed to precisely regulate the flow, pressure, or level of a fluid in a pipeline. They use advanced technology to provide accurate and responsive control over the process. Control butterfly valves can be used for applications where precise control is not necessary, such as in HVAC systems or water treatment plants.