A butterfly valve is a valve used to regulate the flow of liquid. A metal disc in the body of valve is positioned perpendicular to the flow in closed position and rotated one quarter of a turn to be parallel to the flow in fully opened position.
Intermediate rotation regulate flow of liquid. They are often used in agricultural and water or wastewater treatment applications and are one of the most common and well-known valve types.
Advantages:
They are small and Operate ( i.e. open & closed) very quickly.
They are quite reliable & require less maintainace.
Disadvantages:
One disadvantage of butterfly valves is that some portion of the disc is always presented to the flow, even when fully opened. The use of a butterfly valve therefore always results in a pressure switch across the valve, regardless of the setting.
Operation :
Butterfly valves can be configured to operate manually, electronically or pneumatically. Pneumatic valves operate most rapidly. Electronic valves require a signal to the gearbox to open or close, while pneumatic valves can be either single or double actuated.
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