one of types of manual valves-butterfly valve
Butterfly Valves
In Butterfly Valves, the flow is regulated through a disc-type element held in place in the center of the valve by a rod. Similar to Ball Valves, valve operation time is short because the valving element is simply rotated a quarter turn (90°) to open or close the passageway.
Butterfly valves are characterized by their simple construction, lightness in weight, and compact design. Their face-to-face dimension is often extremely small, making the pressure drop across a butterfly valve much smaller than globe valves (see below). Materials used for the valving element and sealing can limit their applications at higher temperatures or with certain types of fluids. Butterfly valves are often used on applications for water and air, and in applications with large pipe diameters.
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