advantages of butterfly valves
A Butterfly Valve is a disk mounted on a rotating shaft. When fully closed, the disk completely blocks the line. When fully opened, the disk is at a right angle to the flow of gas or liquid.
One of the advantages for butterfly valves is that they are relatively inexpensive to build and maintain. They are the most common valve for large volume water systems such as municipal water works. They can be used for dirty liquid applications such as sewage or controlling river water.
The Butterfly Valve disk is still in the valve flow line when fully open, so there will always be a pressure drop across a butterfly valve. Also, if the pressure difference across the butterfly valve is great, it may be difficult to open the valve. Some applications require a bypass valve to bring the pressure difference down before large butterfly valves can operate.
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