A butterfly valve works through a relatively simple yet effective mechanism. The valve consists of a circular disc, often called the "butterfly," which is mounted on a shaft within the valve body.
When the valve is in the open position, the disc is rotated to be parallel to the flow of the fluid or gas passing through the valve. This allows the medium to flow freely with minimal resistance.
To close the valve, the disc is rotated by 90 degrees so that it is perpendicular to the flow. This blocks the passage, restricting or completely stopping the flow.
The rotation of the disc is typically controlled by an actuator, which can be manual or automatic
The sealing around the disc is crucial to prevent leakage. This is often achieved through the use of elastomeric seals or gaskets that create a tight fit when the valve is closed.
For example, in a water supply pipeline, when the butterfly valve is opened, water can flow smoothly through the pipe. Closing the valve stops the water flow, allowing for maintenance or control of the water distribution.
In an HVAC system, a butterfly valve can regulate the flow of air by opening or closing the disc as needed to control the temperature and air volume.
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