The butterfly valve provides a damper that is rotated to adjust the resistance to flow. This valve provides a small pressure drop for gas flows.
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A valve with a circular body and a rotary motion disk closure member which is pivotally supported by its stem. Butterfly valves come in various styles including eccestric and high-performance valves.
Butterfly valves are high recovery valves and thus tend to induce cavitation in liquid services at much lower pressure drops and fluid temperature than the globe style valves, many people limit the travel of the valve at 60 degrees of rotation on throttling services. This can also help keep the valve out of cavitation problems.
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