Butterfly valves are 90-degree rotary motion valves utilized in regulating, stopping, and starting the flow of media. They are valves that are easy to open, and turning the handles a quarter-turn will fully open or close the valve. The butterfly valve is usually used in systems where a positive shut-off is needed. You can describe the valve as a disk connected to a rod, and when the rod turns the disc (quarter-turn), the valve closes. The position achieved by this rotation is usually perpendicular to the direction of the flow. During the opening, you rotate the disk back to permit the flow of fluid.
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The butterfly valves are usually popular since they have some features that make them desirable. Such features include a quick operation, being available in multiple sizes, cost-effective, lightweight valves, and having a small footprint during installation. The operation of these butterfly valves can either be through gears, automatic actuators, or operated using handles. Whichever way you choose, the valves are efficient and reliable for piping systems.
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Most large valves usually have an actuator in the form of a gearbox, and the handwheel is normally connected to the stem through the gearbox. This arrangement reduces the force and speed of operation. You should install such a valve in the open position to prevent the rubber seat from wedging against the valve disc making opening difficult. Smaller valves are normally operated manually since they do not require a lot of force compared to the larger ones.
In terms of design, the butterfly valve can either be centric or eccentric. Centric valves have their stem at the center of the disc, which is in the middle of the bore. For the eccentric design, the stem usually one or two are not situated at the center of the disc. They are either double eccentric or triple eccentric.
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