The butterfly valve is a quarter-turn valve that can initiate the throttling and control of flow fluids. Because of its name, anyone can easily visualize a thin metal disc that “flutters” around a fixed axis. The flow of a medium among the downstream and upstream pipe is restricted by the closing and opening mechanism. These valves are regulated rotary valves which comprise a rotating disk that can direct the flow of fluid inside a system. Up to around 90 degrees, the disk can be operated and because of that, it is known as a quarter-turn valve. These valves can control the linear flow and can be bi-directional. These valves mostly have a similar operation and construction to a ball valve but are much lighter and cost-effective.
These valves mostly belong to the quarter-turn valves and they have a rotating disc for regulating the medium flow. At the center of the body of the valve, the disc is held by a stem. In contrast with gate valves, the butterfly valves have a short operation time as the operator is only rotated to 90° for preventing or allowing the flow of the fluid in the passageway. These valves are mainly operated with an actuator which turns the disc of the valve either perpendicular or parallels with the flow. The disc is in a parallel position to the flow when the valve remains in a completely open state and otherwise, it remains perpendicular to the flow. On top of that, the thick of the butterfly valve creates a resistance that can obstruct the medium flow and creates a drop of pressure even if the valve is completely open.
Application
of Butterfly Valve
In comparison with gate valves, the industrial butterfly valves are much lighter and are much more convenient for operation and installation for the dealing of the application with large pipe diameters. They are highly suitable for installation where there is limited space in which wafer type of butterfly valves are recommended.
Advantages
· Easy to install
· Lightweight and compact
· Low maintenance
· Low-pressure loss
· Simple, rapid operation
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