A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a
disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored
because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required.
The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside
of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the
disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve
position.A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or
closed when the disc is rotated a quarter turn
https://en.wikipedia.org/wiki/Butterfly_valve
lower in cost to other valve designs as well as being lighter in weight
quarter-turn valves.
The zero offset butterfly valve
The high performance double offset butterfly valve, used in slightly higher-pressure systems
https://en.wikipedia.org/wiki/Butterfly_valve
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Post time: Jun-04-2017