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If needing a valve for regulating the flow of liquids, an excellent device is a butterfly valve. Butterfly valves are in a category of valves referred to as "quarter-turn valves." A disc is employed to effect the valve opening and closing, allowing for immediate shut-off. The advantage of a butterfly valve is that it is less expensive than most other types of valves and it weighs less, making the entire construct around the butterfly valve less heavy and therefore less complicated to assemble and more economical. The design of a  butterfly valve is such that the disc is placed in the center of the valve with a rod passing through the center of the disc. The rod is connected to the outside of the valve to an actuator, which, when rotated, turns the disc. ... Read more

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