A butterfly valve is one of the most commonly used valves. It is highly sorted after, because of the lower costs and also the easy to use a mechanism that helps in using the valve through low mechanical strength. The size of the valve also makes it one of the best options to choose from. The basic needs of a valve satisfied under the lowest of costs compared to its competitors and also the simple mechanism of working make it a good choice for any industry. Less weight of the valve also makes it easy for using anywhere. There is no necessity for a support to use the valve.
Let Us See How The Butterfly Valve Works:
The valve has a disc-like structure. It is fit into the pipe, and the only part visible outside is only the handle. A rod is connected to the handle and this rod is attached with the disc that serves as the main flow regulator. This disc is placed in such a way that it is perpendicular to the pipes direction. The disc can be rotated with the help of the handle. If the disc is perpendicular to the flow of the material, it is in an open state and allows the maximum rate of flow. If it is in the parallel direction of the flow, then it obstructs the flow and is said to be in a closed state.
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This valve comes under the category of the quarter-turn valves. This means that the valve is fully open or closed when the disc is rotated quarter-turn. In this valve the disc that obstructs or allows the flow, is always present in contact with the contents of the flow. Hence, it always provides some amount of resistance to the flow irrespective of its closed or open state.
Teflon Coated Butterfly:
The butterfly valve by itself is very much useful, but to enhance its utility and also to make it more beneficial, it can be often found with a Teflon coating on the disc.
The Teflon coating makes the butterfly valve more resistant to temperature than usual and also decreases the friction.
Teflon typically is known for its lowest co-efficient of friction measured against steel. It is the only known substance that is not- sticky. Nothing can ever stick to Teflon. Therefore, when Teflon is coated on the disc of the butterfly valve, the natural resistance it causes to the flow of contents is reduced to a great extent.
The average temperature of the high-temperature contents used to transport along the pipes in any industry is around 200°C. The melting point of Teflon is 327°C. This allows Teflon to comfortably be used in the valve. At high temperatures, Teflon is flexible and inert. Even if you heat it till 300°C Teflon will not react with any chemical substance. So, the Teflon coated butterfly valves can be used in the pipes that carry any contents.
Teflon also being high- pressure bearing can help in resisting any amount of pressures by the contents on the valve.
Thus, the normal butterfly valve when used with a Teflon coating makes it highly durable with persistent desirable properties like heat-resistance, and pressure bearing capacity.