An on/off butterfly valve is a type of butterfly valve designed specifically for fully opening or fully closing the flow within a pipeline, offering simple and effective shutoff control. Operated either manually or with actuators, these valves do not regulate flow but instead serve as reliable isolation devices. On/off butterfly valves offer cost-efficiency, low pressure drop, and ease of maintenance, along with quick quarter-turn operation and a compact design. They are ideal for systems requiring fast and frequent shutoff, such as in water distribution, wastewater treatment, and industrial automation.