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A little knowledge about butterfly valve

    Butterfly valves are different from other valves . They are simple, easy to install, and easy to use. A butterfly valve uses a disc that turns 90° to allow materials to flow through. The disc of a butterfly valve allows it to be used for throttling flow as well as closing it entirely,This style of valve is especially used for water, gasses, fire protection, viscous materials, and high-pressure/ high temperature water. They are thinner than other valves which makes them preferable in situations where space is an issue . Many butterfly valves use an actuator to assist opening, throttling, and closing flow, but the type of gear-operated and lever-operated is also common as well .
    One special aspect of the disc is that it is hollow through the middle. This is so that the stem can be inserted into it. Sometimes the stem is rectangular or hexed so that it can be fitted inside the disc. Other butterfly valves have a round stem that is secured in place by bolts that go through the disc and stem. These are not appropriate for systems with corrosive materials because it can lead to corrosion of the bolt, and consequently the stem.
    The two body styles for butterfly valves are lugged and wafered。 Lugged butterfly valves are normally threaded, and provide more stable support for mating with connections, but are not necessarily used to secure the flange. Wafered butterfly valves are not threaded and, in some cases, may not even have lead holes. The benefit of this is that when the holes are not in the way, the valve can be more easily positioned before being seated, allowing for better use of space in tight situations.

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